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(3*(2*x+4))/2 = 15 // - 15
(3*(2*x+4))/2-15 = 0
(3*(2*x+4))/2+(-15*2)/2 = 0
3*(2*x+4)-15*2 = 0
6*x-18 = 0
(6*x-18)/2 = 0
(6*x-18)/2 = 0 // * 2
6*x-18 = 0
6*x-18 = 0 // + 18
6*x = 18 // : 6
x = 18/6
x = 3
x = 3
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