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X in (-oo:+oo)
X/4+0 = -4 // + 4
X/4+0+4 = 0
X/4+4 = 0
1/4*X+4 = 0 // - 4
1/4*X = -4 // : 1/4
X = -4/1/4
X = -16
X = -16
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