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n in (-oo:+oo)
-n-1 = 2*n-25 // - 2*n-25
25-n-(2*n)-1 = 0
25-n-2*n-1 = 0
24-3*n = 0 // - 24
-3*n = -24 // : -3
n = -24/(-3)
n = 8
n = 8
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