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n in (-oo:+oo)
(2/3)*n-((1/3)*n) = 6 // - 6
(2/3)*n-((1/3)*n)-6 = 0
(2/3)*n+(-1/3)*n-6 = 0
1/3*n-6 = 0 // + 6
1/3*n = 6 // : 1/3
n = 6/1/3
n = 18
n = 18
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