Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

x-13 == 4*x

⇒ algebra.equations.linear.balance.var-right-minus, term=x

-13 == 3*x

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

-13/3 == x

⇒ algebra.equations.linear.flip

x == -13/3