Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
2 == -7*x+9
⇒ algebra.equations.linear.balance.con-left-minus, term=9-7 == -7*x
⇒ algebra.equations.linear.balance.scale-to-one, factor=-71 == x
⇒ algebra.equations.linear.flipx == 1