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n in (-oo:+oo)
(13/7)*n = 13/14 // - 13/14
(13/7)*n-(13/14) = 0
(13/7)*n-13/14 = 0
13/7*n-13/14 = 0 // + 13/14
13/7*n = 13/14 // : 13/7
n = 13/14/13/7
n = 1/2
n = 1/2
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