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n in (-oo:+oo)
4/15 = n/100 // - n/100
4/15-(n/100) = 0
4/15-1/100*n = 0 // - 4/15
-1/100*n = -4/15 // : -1/100
n = -4/15/(-1/100)
n = 80/3
n = 80/3
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