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n in (-oo:+oo)
-3/10 = n/15 // - n/15
-(n/15)-3/10 = 0
-1/15*n-3/10 = 0 // + 3/10
-1/15*n = 3/10 // : -1/15
n = 3/10/(-1/15)
n = -9/2
n = -9/2
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