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X in (-oo:+oo)
X/2+1 = 5/4 // - 5/4
X/2-(5/4)+1 = 0
X/2-5/4+1 = 0
1/2*X-1/4 = 0 // + 1/4
1/2*X = 1/4 // : 1/2
X = 1/4/1/2
X = 1/2
X = 1/2
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