Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
-4 == -2*x
⇒ algebra.equations.linear.flip-2*x == -4
⇒ algebra.equations.linear.balance.negate2*x == 4
⇒ algebra.equations.linear.balance.scale-to-one, factor=2x == 2