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n in (-oo:+oo)
(2/3)*n+8 = (1/3)*n-2 // - (1/3)*n-2
(2/3)*n-((1/3)*n)+2+8 = 0
(2/3)*n+(-1/3)*n+2+8 = 0
1/3*n+10 = 0 // - 10
1/3*n = -10 // : 1/3
n = -10/1/3
n = -30
n = -30
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