$40+$15+$0.25x=$45+$0.35x
that's how i do it.Aghhhhhh
40+15+.25x=45+.35x55+.25x=45+.35x -.25x -.25x55=45+.10x -45_-45__________ 10 .10x / / .10 .10 100 = x
