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(2*x-17)/3 = 15 // - 15
(2*x-17)/3-15 = 0
(2*x-17)/3+(-15*3)/3 = 0
2*x-15*3-17 = 0
2*x-62 = 0
(2*x-62)/3 = 0
(2*x-62)/3 = 0 // * 3
2*x-62 = 0
2*x-62 = 0 // + 62
2*x = 62 // : 2
x = 62/2
x = 31
x = 31
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