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n in (-oo:+oo)
(2/3)*n-((1/3)*n)+11 = 8 // - 8
(2/3)*n-((1/3)*n)-8+11 = 0
(2/3)*n+(-1/3)*n-8+11 = 0
1/3*n+3 = 0 // - 3
1/3*n = -3 // : 1/3
n = -3/1/3
n = -9
n = -9
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