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X in (-oo:+oo)
X/4 = -1.25 // + 1.25
X/4+1.25 = 0
1/4*X+1.25 = 0 // - 1.25
1/4*X = -1.25 // : 1/4
X = -1.25/1/4
X = -5
X = -5
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