Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
-6 == -13*x-15
⇒ algebra.equations.linear.balance.con-left-plus, term=159 == -13*x
⇒ algebra.equations.linear.balance.scale-to-one, factor=-13-9/13 == x
⇒ algebra.equations.linear.flipx == -9/13