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n in (-oo:+oo)
n/(-7) = 6/7 // - 6/7
n/(-7)-(6/7) = 0
n/(-7)-6/7 = 0
-1/7*n-6/7 = 0 // + 6/7
-1/7*n = 6/7 // : -1/7
n = 6/7/(-1/7)
n = -6
n = -6
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