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