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n in (-oo:+oo)
(1/3)*n+1 = 13/18 // - 13/18
(1/3)*n-(13/18)+1 = 0
(1/3)*n-13/18+1 = 0
1/3*n+5/18 = 0 // - 5/18
1/3*n = -5/18 // : 1/3
n = -5/18/1/3
n = -5/6
n = -5/6
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