Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

-1-5*x == 3*x-20

⇒ algebra.equations.linear.balance.var-right-plus, term=5*x

-1 == 8*x-20

⇒ algebra.equations.linear.balance.con-left-plus, term=20

19 == 8*x

⇒ algebra.equations.linear.balance.scale-to-one, factor=8

19/8 == x

⇒ algebra.equations.linear.flip

x == 19/8