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(x-5)/40 = 10 // - 10
(x-5)/40-10 = 0
(x-5)/40+(-10*40)/40 = 0
x-10*40-5 = 0
x-405 = 0
(x-405)/40 = 0
(x-405)/40 = 0 // * 40
x-405 = 0
x-405 = 0 // + 405
x = 405
x = 405
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