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X in (-oo:+oo)
X^2-X^2-(6/2)+4/4 = 5 // - 5
X^2-X^2-(6/2)+4/4-5 = 0
X^2-X^2+4/4-5-3 = 0
-7 = 0
X belongs to the empty set
X belongs to the empty set
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