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X in (-oo:+oo)
X/2 = -1.5 // + 1.5
X/2+1.5 = 0
1/2*X+1.5 = 0 // - 1.5
1/2*X = -1.5 // : 1/2
X = -1.5/1/2
X = -3
X = -3
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