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(3*x-1)/7 = 5 // - 5
(3*x-1)/7-5 = 0
(3*x-1)/7+(-5*7)/7 = 0
3*x-5*7-1 = 0
3*x-36 = 0
(3*x-36)/7 = 0
(3*x-36)/7 = 0 // * 7
3*x-36 = 0
3*x-36 = 0 // + 36
3*x = 36 // : 3
x = 36/3
x = 12
x = 12
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