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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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