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(6*(x+15))/2 = 72 // - 72
(6*(x+15))/2-72 = 0
(6*(x+15))/2+(-72*2)/2 = 0
6*(x+15)-72*2 = 0
6*x-54 = 0
(6*x-54)/2 = 0
(6*x-54)/2 = 0 // * 2
6*x-54 = 0
6*x-54 = 0 // + 54
6*x = 54 // : 6
x = 54/6
x = 9
x = 9
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