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X in (-oo:+oo)
(X-1)/2 = -8 // + 8
(X-1)/2+8 = 0
(X-1)/2+(2*8)/2 = 0
X+2*8-1 = 0
X+15 = 0
(X+15)/2 = 0
(X+15)/2 = 0 // * 2
X+15 = 0
X+15 = 0 // - 15
X = -15
X = -15
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