Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-13 == -29*x+3*(3*x-6)

⇒ algebra.equations.linear.flip

-29*x+3*(3*x-6) == -13

⇒ algebra.equations.linear.balance.distribute

-29*x+9*x-18 == -13

⇒ algebra.equations.linear.balance.collect

-20*x-18 == -13

⇒ algebra.equations.linear.balance.con-right-plus, term=18

-20*x == 5

⇒ algebra.equations.linear.balance.scale-to-one, factor=-20

x == -1/4