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n in (-oo:+oo)
(1/3)*n+2 = (2/3)*n+4 // - (2/3)*n+4
(1/3)*n-((2/3)*n)-4+2 = 0
(1/3)*n+(-2/3)*n-4+2 = 0
-1/3*n-2 = 0 // + 2
-1/3*n = 2 // : -1/3
n = 2/(-1/3)
n = -6
n = -6
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