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n in (-oo:+oo)
18/30 = n/15 // - n/15
18/30-(n/15) = 0
3/5-1/15*n = 0 // - 3/5
-1/15*n = -3/5 // : -1/15
n = -3/5/(-1/15)
n = 9
n = 9
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