Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-2*x+7/2 == 9/10

⇒ algebra.equations.linear.balance.remove-div, factor=10

-20*x+35 == 9

⇒ algebra.equations.linear.balance.con-right-minus, term=35

-20*x == -26

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

x == 13/10