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(x+136+200)/3 = 160 // - 160
(x+136+200)/3-160 = 0
(x+336)/3-160 = 0
(x+336)/3+(-160*3)/3 = 0
x-160*3+336 = 0
x-144 = 0
(x-144)/3 = 0
(x-144)/3 = 0 // * 3
x-144 = 0
x-144 = 0 // + 144
x = 144
x = 144
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