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X in (-oo:+oo)
-3 = (5/4)*X // - (5/4)*X
-((5/4)*X)-3 = 0
(-5/4)*X-3 = 0
-5/4*X-3 = 0 // + 3
-5/4*X = 3 // : -5/4
X = 3/(-5/4)
X = -12/5
X = -12/5
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