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X in (-oo:+oo)
X-(5/2) = 4*X-(20/8) // - 4*X-(20/8)
X-(4*X)-(5/2)+20/8 = 0
X-4*X-5/2+20/8 = 0
-3*X = 0 // : -3
X = 0
X = 0
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