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