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(3*x+1)/2 = 4 // - 4
(3*x+1)/2-4 = 0
(3*x+1)/2+(-4*2)/2 = 0
3*x-4*2+1 = 0
3*x-7 = 0
(3*x-7)/2 = 0
(3*x-7)/2 = 0 // * 2
3*x-7 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x = 7/3
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