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n in (-oo:+oo)
-(5*n)-1 = -41 // + 41
41-(5*n)-1 = 0
41-5*n-1 = 0
40-5*n = 0 // - 40
-5*n = -40 // : -5
n = -40/(-5)
n = 8
n = 8
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