Exercise algebra.equations.linear.balance
Description
Solve a linear equation using only balance rules.
Derivation
0 == 4*x+18
⇒ algebra.equations.linear.balance.con-left-minus, term=18-18 == 4*x
⇒ algebra.equations.linear.balance.scale-to-one, factor=4-9/2 == x
⇒ algebra.equations.linear.flipx == -9/2