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 == 7*x-8
⇒ algebra.equations.linear.balance.var-left-minus, term=7*x-3*x == -8
⇒ algebra.equations.linear.balance.scale-to-one, factor=-3x == 8/3