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n in (-oo:+oo)
3-((2/9)*n) = (1/3)*n-7 // - (1/3)*n-7
3-((2/9)*n)-((1/3)*n)+7 = 0
(-2/9)*n+(-1/3)*n+3+7 = 0
10-5/9*n = 0 // - 10
-5/9*n = -10 // : -5/9
n = -10/(-5/9)
n = 18
n = 18
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