Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-1/3*x == 1/4*x-7/12

⇒ algebra.equations.linear.balance.remove-div, factor=12

-4*x == 3*x-7

⇒ algebra.equations.linear.balance.var-left-minus, term=3*x

-7*x == -7

⇒ algebra.equations.linear.balance.scale-to-one, factor=-7

x == 1