These are equations involving only one variable, like x, and nothing complicated like powers or
square roots. With this special educational program you learn how to resolve them. You can choose
out of four different exercises, and to challenge your knowledge you can play the falling blocks
style game \'Valgebra\': By manoeuvring the falling x-terms and numbers, you resolve an equation.
But take care.., if you make a mistake, you are penalised by a reduction in the size of the container,
which immediately makes it harder to control successive terms precisely!