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n in (-oo:+oo)
(5/18)*n-((4/9)*n) = 1/12 // - 1/12
(5/18)*n-((4/9)*n)-(1/12) = 0
(5/18)*n+(-4/9)*n-1/12 = 0
-1/6*n-1/12 = 0 // + 1/12
-1/6*n = 1/12 // : -1/6
n = 1/12/(-1/6)
n = -1/2
n = -1/2
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