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