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x in (-oo:+oo)
(x+25)/8 = 5 // - 5
(x+25)/8-5 = 0
(x+25)/8+(-5*8)/8 = 0
x-5*8+25 = 0
x-15 = 0
(x-15)/8 = 0
(x-15)/8 = 0 // * 8
x-15 = 0
x-15 = 0 // + 15
x = 15
x = 15
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