Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
-4*x == 3*x-7
⇒ algebra.equations.linear.balance.var-left-minus, term=3*x-7*x == -7
⇒ algebra.equations.linear.balance.scale-to-one, factor=-7x == 1