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n in (-oo:+oo)
5*(-(5*n)-1) = -80 // + 80
5*(-(5*n)-1)+80 = 0
5*(-5*n-1)+80 = 0
5*(-5*n-1)+80 = 0
75-25*n = 0
75-25*n = 0
75-25*n = 0 // - 75
-25*n = -75 // : -25
n = -75/(-25)
n = 3
n = 3
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