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X in (-oo:+oo)
X/8 = -4/8 // + -4/8
X/8-(-4/8) = 0
X/8+1/2 = 0
1/8*X+1/2 = 0 // - 1/2
1/8*X = -1/2 // : 1/8
X = -1/2/1/8
X = -4
X = -4
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