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n in (-oo:+oo)
-(3*n)-1 = -13 // + 13
13-(3*n)-1 = 0
13-3*n-1 = 0
12-3*n = 0 // - 12
-3*n = -12 // : -3
n = -12/(-3)
n = 4
n = 4
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