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n in (-oo:+oo)
3*n-9 = 5*n-17 // - 5*n-17
3*n-(5*n)-9+17 = 0
3*n-5*n-9+17 = 0
8-2*n = 0 // - 8
-2*n = -8 // : -2
n = -8/(-2)
n = 4
n = 4
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