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n in (-oo:+oo)
5*(-1*n-6) = -85 // + 85
5*(-1*n-6)+85 = 0
5*(-n-6)+85 = 0
5*(-n-6)+85 = 0
55-5*n = 0
55-5*n = 0
55-5*n = 0 // - 55
-5*n = -55 // : -5
n = -55/(-5)
n = 11
n = 11
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