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n in (-oo:+oo)
9/10 = n/15 // - n/15
9/10-(n/15) = 0
9/10-1/15*n = 0 // - 9/10
-1/15*n = -9/10 // : -1/15
n = -9/10/(-1/15)
n = 27/2
n = 27/2
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