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n in (-oo:+oo)
n/(-7) = -5/6 // + -5/6
n/(-7)-(-5/6) = 0
n/(-7)+5/6 = 0
5/6-1/7*n = 0 // - 5/6
-1/7*n = -5/6 // : -1/7
n = -5/6/(-1/7)
n = 35/6
n = 35/6
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