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n in (-oo:+oo)
(1/3)*n-(1/6) = 2 // - 2
(1/3)*n-(1/6)-2 = 0
(1/3)*n-1/6-2 = 0
1/3*n-13/6 = 0 // + 13/6
1/3*n = 13/6 // : 1/3
n = 13/6/1/3
n = 13/2
n = 13/2
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