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n in (-oo:+oo)
n/(-4) = -3/5 // + -3/5
n/(-4)-(-3/5) = 0
n/(-4)+3/5 = 0
3/5-1/4*n = 0 // - 3/5
-1/4*n = -3/5 // : -1/4
n = -3/5/(-1/4)
n = 12/5
n = 12/5
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