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n in (-oo:+oo)
-11 = n/15-10 // - n/15-10
10-(n/15)-11 = 0
-1/15*n-1 = 0 // + 1
-1/15*n = 1 // : -1/15
n = 1/(-1/15)
n = -15
n = -15
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