Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

1/2*x == 2*x+13/2

⇒ algebra.equations.linear.balance.remove-div, factor=2

x == 4*x+13

⇒ algebra.equations.linear.balance.var-left-minus, term=4*x

-3*x == 13

⇒ algebra.equations.linear.balance.scale-to-one, factor=-3

x == -13/3