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n in (-oo:+oo)
3*n+5/9 = 4*n-35/99 // - 4*n-35/99
3*n-(4*n)+5/9-(-35/99) = 0
3*n-4*n+5/9+35/99 = 0
10/11-n = 0 // - 10/11
-n = -10/11 // * -1
n = 10/11
n = 10/11
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