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