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n in (-oo:+oo)
2-n = 2*n-25 // - 2*n-25
2-n-(2*n)+25 = 0
2-n-2*n+25 = 0
27-3*n = 0 // - 27
-3*n = -27 // : -3
n = -27/(-3)
n = 9
n = 9
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