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n in (-oo:+oo)
(6/27)*n+(18/27)*n+1/2+2 = 0
8/9*n+5/2 = 0 // - 5/2
8/9*n = -5/2 // : 8/9
n = -5/2/8/9
n = -45/16
n = -45/16
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