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n in (-oo:+oo)
(2/3)*(1-n) = (-1/2)*n // - (-1/2)*n
(2/3)*(1-n)-((-1/2)*n) = 0
(2/3)*(1-n)+(1/2)*n = 0
2/3*(1-n)+n/2 = 0
(2/3*2*(1-n))/2+n/2 = 0
2/3*2*(1-n)+n = 0
4/3-1/3*n = 0
(4/3-1/3*n)/2 = 0
(4/3-1/3*n)/2 = 0 // * 2
4/3-1/3*n = 0
4/3-1/3*n = 0 // - 4/3
-1/3*n = -4/3 // : -1/3
n = -4/3/(-1/3)
n = 4
n = 4
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