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n in (-oo:+oo)
-(6*n)-6 = 60 // - 60
-(6*n)-60-6 = 0
-6*n-60-6 = 0
-6*n-66 = 0 // + 66
-6*n = 66 // : -6
n = 66/(-6)
n = -11
n = -11
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