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n in (-oo:+oo)
-7/15 = n/15 // - n/15
-(n/15)-7/15 = 0
-1/15*n-7/15 = 0 // + 7/15
-1/15*n = 7/15 // : -1/15
n = 7/15/(-1/15)
n = -7
n = -7
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