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(3*(x+12))/5 = 30 // - 30
(3*(x+12))/5-30 = 0
(3*(x+12))/5+(-30*5)/5 = 0
3*(x+12)-30*5 = 0
3*x-114 = 0
(3*x-114)/5 = 0
(3*x-114)/5 = 0 // * 5
3*x-114 = 0
3*x-114 = 0 // + 114
3*x = 114 // : 3
x = 114/3
x = 38
x = 38
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