Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

18 == 5*x+3

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

15 == 5*x

⇒ algebra.equations.linear.balance.scale-to-one, factor=5

3 == x

⇒ algebra.equations.linear.flip

x == 3