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diff --git a/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/expression/BasicExpression.java b/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/expression/BasicExpression.java
new file mode 100644
index 000000000..e2ac33516
--- /dev/null
+++ b/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/expression/BasicExpression.java
@@ -0,0 +1,72 @@
+package org.simantics.modeling.ui.expression;
+
+import org.simantics.basicexpression.Expressions;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.Bindings;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.variable.EquationExpression;
+import org.simantics.db.layer0.variable.Expression;
+import org.simantics.db.layer0.variable.Variable;
+import org.simantics.utils.datastructures.Triple;
+
+public class BasicExpression implements Expression, EquationExpression {
+
+	final private Resource expression;
+	
+	public BasicExpression(Resource expression) {
+		this.expression = expression;
+	}
+	
+	@Override
+	public <T> T evaluate(ReadGraph graph, Variable property, Binding binding) throws DatabaseException {
+		return evaluate(graph, property);
+	}
+
+	@SuppressWarnings("unchecked")
+    @Override
+	public <T> T evaluate(ReadGraph graph, Variable property) throws DatabaseException {
+	
+		String expressionString = graph.getValue(expression, Bindings.STRING);
+		BasicExpressionVisitor visitor = new BasicExpressionVisitor(graph, property);
+		Expressions.evaluate(expressionString, visitor);
+		return (T)visitor.getResult();
+		
+	}
+
+	@Override
+	public <T> void invert(WriteGraph graph, Variable property, T value, Binding binding) throws DatabaseException {
+		
+		String expressionString = graph.getValue(expression, Bindings.STRING);
+		InvertBasicExpressionVisitor visitor = new InvertBasicExpressionVisitor();
+		Expressions.evaluate(expressionString, visitor);
+		Object pair = visitor.getResult();
+		if(pair instanceof Triple) {
+			@SuppressWarnings("unchecked")
+			Triple<Double, Double, String> data = (Triple<Double, Double, String>)pair;
+			if(Math.abs(data.first) > 1e-9) {
+				Double inverted = ((Double)value - data.second) / data.first;
+				String target = data.third;
+				Variable targetVariable = property.browse(graph, target);
+//				System.out.println("invert: " + target + " = " + property.browse(graph, target).getURI(graph));
+				targetVariable.setValue(graph, inverted, binding);
+			}
+		}
+		
+	}
+
+	@Override
+	public boolean isInvertible(ReadGraph graph, Variable property) throws DatabaseException {
+		
+		String expressionString = graph.getValue(expression, Bindings.STRING);
+		InvertBasicExpressionVisitor visitor = new InvertBasicExpressionVisitor();
+		Expressions.evaluate(expressionString, visitor);
+		Object value = visitor.getResult();
+		if(value instanceof Triple) return true;
+		else return false;
+		
+	}
+
+}