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(x+72+76+80)/4 = 80 // - 80
(x+72+76+80)/4-80 = 0
(x+228)/4-80 = 0
(x+228)/4+(-80*4)/4 = 0
x-80*4+228 = 0
x-92 = 0
(x-92)/4 = 0
(x-92)/4 = 0 // * 4
x-92 = 0
x-92 = 0 // + 92
x = 92
x = 92
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