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