Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-9/4*x+1/2 == 2

⇒ algebra.equations.linear.balance.remove-div, factor=4

-9*x+2 == 8

⇒ algebra.equations.linear.balance.con-right-minus, term=2

-9*x == 6

⇒ algebra.equations.linear.balance.scale-to-one, factor=-9

x == -2/3