Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

4*x+8 == 7*x

⇒ algebra.equations.linear.balance.var-right-minus, term=4*x

8 == 3*x

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

8/3 == x

⇒ algebra.equations.linear.flip

x == 8/3