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n in (-oo:+oo)
n/2 = n+7/8 // - n+7/8
n/2-n-(7/8) = 0
n/2-n-7/8 = 0
-1/2*n-7/8 = 0 // + 7/8
-1/2*n = 7/8 // : -1/2
n = 7/8/(-1/2)
n = -7/4
n = -7/4
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