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X in (-oo:+oo)
X/6 = -15/2 // + -15/2
X/6-(-15/2) = 0
X/6+15/2 = 0
1/6*X+15/2 = 0 // - 15/2
1/6*X = -15/2 // : 1/6
X = -15/2/1/6
X = -45
X = -45
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