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