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