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(9*x-1)/7+(y+13)/8 = -46 // + 46
(9*x-1)/7+(y+13)/8+46 = 0
(8*(9*x-1))/(7*8)+(7*(y+13))/(7*8)+(7*8*46)/(7*8) = 0
8*(9*x-1)+7*(y+13)+7*8*46 = 0
72*x+7*y+83+2576 = 0
72*x+7*y+2659 = 0
(72*x+7*y+2659)/(7*8) = 0
(72*x+7*y+2659)/(7*8) = 0 // * 7*8
72*x+7*y+2659 = 0
72*x+7*y+2659 = 0 // - 7*y+2659
72*x = -(7*y+2659) // : 72
x = (-(7*y+2659))/72
x = (-(7*y+2659))/72
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