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n in (-oo:+oo)
(5/7)*n = 15/28 // - 15/28
(5/7)*n-(15/28) = 0
(5/7)*n-15/28 = 0
5/7*n-15/28 = 0 // + 15/28
5/7*n = 15/28 // : 5/7
n = 15/28/5/7
n = 3/4
n = 3/4
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