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n in (-oo:+oo)
24/15 = n/21 // - n/21
24/15-(n/21) = 0
8/5-1/21*n = 0 // - 8/5
-1/21*n = -8/5 // : -1/21
n = -8/5/(-1/21)
n = 168/5
n = 168/5
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