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