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n in (-oo:+oo)
-(6*n)-1 = -55 // + 55
55-(6*n)-1 = 0
55-6*n-1 = 0
54-6*n = 0 // - 54
-6*n = -54 // : -6
n = -54/(-6)
n = 9
n = 9
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