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n in (-oo:+oo)
-7/6 = n/15 // - n/15
-(n/15)-7/6 = 0
-1/15*n-7/6 = 0 // + 7/6
-1/15*n = 7/6 // : -1/15
n = 7/6/(-1/15)
n = -35/2
n = -35/2
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