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n in (-oo:+oo)
2*n-5 = 5*n-17 // - 5*n-17
2*n-(5*n)-5+17 = 0
2*n-5*n-5+17 = 0
12-3*n = 0 // - 12
-3*n = -12 // : -3
n = -12/(-3)
n = 4
n = 4
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