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(x+8)/2 = 5 // - 5
(x+8)/2-5 = 0
(x+8)/2+(-5*2)/2 = 0
x-5*2+8 = 0
x-2 = 0
(x-2)/2 = 0
(x-2)/2 = 0 // * 2
x-2 = 0
x-2 = 0 // + 2
x = 2
x = 2
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