Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

(x+3)/2-5/2*x == 15/2

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

x+3-5*x == 15

⇒ algebra.equations.linear.balance.collect

-4*x+3 == 15

⇒ algebra.equations.linear.balance.con-right-minus, term=3

-4*x == 12

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

x == -3