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x in (-oo:+oo)
(x+5)/12 = 8 // - 8
(x+5)/12-8 = 0
(x+5)/12+(-8*12)/12 = 0
x-8*12+5 = 0
x-91 = 0
(x-91)/12 = 0
(x-91)/12 = 0 // * 12
x-91 = 0
x-91 = 0 // + 91
x = 91
x = 91
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