72 + 8x + 18x = 36x
\(72 + 8x + 18x = 36x\) \(72+26x=36x\) \(72=36x-26x\) \(\text{Subtract 26x from both sides}\) \(72=10x\) \(\text{Divide both sides by 10}\) \(x=36/5\)
