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n in (-oo:+oo)
-5/6 = n/15 // - n/15
-(n/15)-5/6 = 0
-1/15*n-5/6 = 0 // + 5/6
-1/15*n = 5/6 // : -1/15
n = 5/6/(-1/15)
n = -25/2
n = -25/2
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