Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
-20*x+35 == 9
⇒ algebra.equations.linear.balance.con-right-minus, term=35-20*x == -26
⇒ algebra.equations.linear.balance.scale-to-one, factor=-20x == 13/10