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