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(2*x-68)/20 = 20 // - 20
(2*x-68)/20-20 = 0
(2*x-68)/20+(-20*20)/20 = 0
2*x-20*20-68 = 0
2*x-468 = 0
(2*x-468)/20 = 0
(2*x-468)/20 = 0 // * 20
2*x-468 = 0
2*x-468 = 0 // + 468
2*x = 468 // : 2
x = 468/2
x = 234
x = 234
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