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n in (-oo:+oo)
7/15 = n/2 // - n/2
7/15-(n/2) = 0
7/15-1/2*n = 0 // - 7/15
-1/2*n = -7/15 // : -1/2
n = -7/15/(-1/2)
n = 14/15
n = 14/15
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