Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
9 == 7*x+2
⇒ algebra.equations.linear.balance.con-left-minus, term=27 == 7*x
⇒ algebra.equations.linear.balance.scale-to-one, factor=71 == x
⇒ algebra.equations.linear.flipx == 1