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