Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
-7*x+8 == 0
⇒ algebra.equations.linear.balance.con-right-minus, term=8-7*x == -8
⇒ algebra.equations.linear.balance.scale-to-one, factor=-7x == 8/7