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n in (-oo:+oo)
(1/3)*n+6 = 29/3 // - 29/3
(1/3)*n-(29/3)+6 = 0
(1/3)*n-29/3+6 = 0
1/3*n-11/3 = 0 // + 11/3
1/3*n = 11/3 // : 1/3
n = 11/3/1/3
n = 11
n = 11
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