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(6*x-1)/5 = 13 // - 13
(6*x-1)/5-13 = 0
(6*x-1)/5+(-13*5)/5 = 0
6*x-13*5-1 = 0
6*x-66 = 0
(6*x-66)/5 = 0
(6*x-66)/5 = 0 // * 5
6*x-66 = 0
6*x-66 = 0 // + 66
6*x = 66 // : 6
x = 66/6
x = 11
x = 11
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