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(4*(3*x-1))/7 = 8 // - 8
(4*(3*x-1))/7-8 = 0
(4*(3*x-1))/7+(-8*7)/7 = 0
4*(3*x-1)-8*7 = 0
12*x-60 = 0
(12*x-60)/7 = 0
(12*x-60)/7 = 0 // * 7
12*x-60 = 0
12*x-60 = 0 // + 60
12*x = 60 // : 12
x = 60/12
x = 5
x = 5
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