Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-7 == -9*x-24

⇒ algebra.equations.linear.balance.con-left-plus, term=24

17 == -9*x

⇒ algebra.equations.linear.balance.scale-to-one, factor=-9

-17/9 == x

⇒ algebra.equations.linear.flip

x == -17/9