Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-5*x+4 == -3*x

⇒ algebra.equations.linear.balance.var-right-plus, term=5*x

4 == 2*x

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

2 == x

⇒ algebra.equations.linear.flip

x == 2