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n in (-oo:+oo)
13/28 = n+5/7 // - n+5/7
13/28-n-(5/7) = 0
13/28-n-5/7 = 0
-n-1/4 = 0 // + 1/4
-n = 1/4 // * -1
n = -1/4
n = -1/4
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