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