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4*(3*x+1/2)+7 = 15 // - 15
4*(3*x+1/2)-15+7 = 0
4*(3*x+1/2)-15+7 = 0
12*x-13+7 = 0
12*x-6 = 0
12*x-6 = 0
12*x-6 = 0 // + 6
12*x = 6 // : 12
x = 6/12
x = 1/2
x = 1/2
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