Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

8*x-20 == 10*x

⇒ algebra.equations.linear.balance.var-right-minus, term=8*x

-20 == 2*x

⇒ algebra.equations.linear.balance.scale-to-one, factor=2

-10 == x

⇒ algebra.equations.linear.flip

x == -10