Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
-x+13 == 4*x
⇒ algebra.equations.linear.balance.var-right-plus, term=x13 == 5*x
⇒ algebra.equations.linear.balance.scale-to-one, factor=513/5 == x
⇒ algebra.equations.linear.flipx == 13/5