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n in (-oo:+oo)
(2/3)*n-((6/6)*n^12)-n = 0
(2/3)*n-n^12-n = 0
-n^12-1/3*n = 0
-n*(n^11+1/3) = 0
1*n^11 = -1/3 // : 1
n^11 = -1/3
n^11 = -1/3 // ^ 1/11
n = -(1/3)^(1/11)
-n = 0
-1*n = 0 // : -1
n = 0
n in { -(1/3)^(1/11), 0 }
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