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n in (-oo:+oo)
1*n+7/9 = 3*n+1/9 // - 3*n+1/9
1*n-(3*n)+7/9-(1/9) = 0
n-3*n+7/9-1/9 = 0
2/3-2*n = 0 // - 2/3
-2*n = -2/3 // : -2
n = -2/3/(-2)
n = 1/3
n = 1/3
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