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X in (-oo:+oo)
5/2 = X/3 // - X/3
5/2-(X/3) = 0
5/2-1/3*X = 0 // - 5/2
-1/3*X = -5/2 // : -1/3
X = -5/2/(-1/3)
X = 15/2
X = 15/2
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