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n in (-oo:+oo)
(1/2)*n+1 = 13/11 // - 13/11
(1/2)*n-(13/11)+1 = 0
(1/2)*n-13/11+1 = 0
1/2*n-2/11 = 0 // + 2/11
1/2*n = 2/11 // : 1/2
n = 2/11/1/2
n = 4/11
n = 4/11
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