y=4x+rx+6 solve for x
\(y=4x+rx+6\) \(y-6=4x+rx\) \(Subtract \ 6 \ from \ both \ sides\) \(y-6=x(4+r)\) \(Factor \ out \ the \ common \ term \ x\) \(\dfrac{y-6}{4+r} =x\) \(Divide \ both \ sides \ by \ 4+r\)