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n in (-oo:+oo)
1/3-((4/9)*n) = 2/9 // - 2/9
1/3-((4/9)*n)-(2/9) = 0
(-4/9)*n+1/3-2/9 = 0
1/9-4/9*n = 0 // - 1/9
-4/9*n = -1/9 // : -4/9
n = -1/9/(-4/9)
n = 1/4
n = 1/4
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