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n in (-oo:+oo)
n/5 = n/3+2/15 // - n/3+2/15
n/5-(n/3)-(2/15) = 0
n/5-(n/3)-2/15 = 0
-2/15*n-2/15 = 0 // + 2/15
-2/15*n = 2/15 // : -2/15
n = 2/15/(-2/15)
n = -1
n = -1
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