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X in (-oo:+oo)
19/4 = -X-((15/4)*X) // + -X-((15/4)*X)
X+(15/4)*X+19/4 = 0
19/4*X+19/4 = 0 // - 19/4
19/4*X = -19/4 // : 19/4
X = -19/4/19/4
X = -1
X = -1
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