Exercise algebra.equations.linear.balance

Description
Solve a linear equation using only balance rules.

Derivation

x+8 == 1+2*x

⇒ algebra.equations.linear.balance.var-right-minus, term=x

8 == 1+x

⇒ algebra.equations.linear.balance.con-left-minus, term=1

7 == x

⇒ algebra.equations.linear.flip

x == 7