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X in (-oo:+oo)
X/2 = 5/10 // - 5/10
X/2-(5/10) = 0
X/2-1/2 = 0
1/2*X-1/2 = 0 // + 1/2
1/2*X = 1/2 // : 1/2
X = 1/2/1/2
X = 1
X = 1
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