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