Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-11 == -4*x-13

⇒ algebra.equations.linear.balance.con-left-plus, term=13

2 == -4*x

⇒ algebra.equations.linear.balance.scale-to-one, factor=-4

-1/2 == x

⇒ algebra.equations.linear.flip

x == -1/2