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n in (-oo:+oo)
n/(-6) = -4/5 // + -4/5
n/(-6)-(-4/5) = 0
n/(-6)+4/5 = 0
4/5-1/6*n = 0 // - 4/5
-1/6*n = -4/5 // : -1/6
n = -4/5/(-1/6)
n = 24/5
n = 24/5
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