Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
-12 == -7*x-4
⇒ algebra.equations.linear.balance.con-left-plus, term=4-8 == -7*x
⇒ algebra.equations.linear.balance.scale-to-one, factor=-78/7 == x
⇒ algebra.equations.linear.flipx == 8/7