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n in (-oo:+oo)
8/7 = n/10 // - n/10
8/7-(n/10) = 0
8/7-1/10*n = 0 // - 8/7
-1/10*n = -8/7 // : -1/10
n = -8/7/(-1/10)
n = 80/7
n = 80/7
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