Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
3*x-9 == 10*x-30
⇒ algebra.equations.linear.balance.var-right-minus, term=3*x-9 == 7*x-30
⇒ algebra.equations.linear.balance.con-left-plus, term=3021 == 7*x
⇒ algebra.equations.linear.balance.scale-to-one, factor=73 == x
⇒ algebra.equations.linear.flipx == 3