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X in (-oo:+oo)
X/6 = -0.5 // + 0.5
X/6+0.5 = 0
1/6*X+0.5 = 0 // - 0.5
1/6*X = -0.5 // : 1/6
X = -0.5/1/6
X = -2.99999994
X = -2.99999994
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