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n in (-oo:+oo)
2/5 = n/15 // - n/15
2/5-(n/15) = 0
2/5-1/15*n = 0 // - 2/5
-1/15*n = -2/5 // : -1/15
n = -2/5/(-1/15)
n = 6
n = 6
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