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n in (-oo:+oo)
(1/2)*n-((1*5)/12) = (2/3)*n-((1*2)/6) // - (2/3)*n-((1*2)/6)
(1/2)*n-((2/3)*n)-((1*5)/12)+(1*2)/6 = 0
(1/2)*n+(-2/3)*n-5/12+2/6 = 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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