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x in (-oo:+oo)
(x-8)/4 = 5 // - 5
(x-8)/4-5 = 0
(x-8)/4+(-5*4)/4 = 0
x-5*4-8 = 0
x-28 = 0
(x-28)/4 = 0
(x-28)/4 = 0 // * 4
x-28 = 0
x-28 = 0 // + 28
x = 28
x = 28
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