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