Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

0 == -4+2*x

⇒ algebra.equations.linear.balance.con-left-plus, term=4

4 == 2*x

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

2 == x

⇒ algebra.equations.linear.flip

x == 2