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