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n in (-oo:+oo)
(5/7)*n-(3/14) = 1/2 // - 1/2
(5/7)*n-(3/14)-(1/2) = 0
(5/7)*n-3/14-1/2 = 0
5/7*n-5/7 = 0 // + 5/7
5/7*n = 5/7 // : 5/7
n = 5/7/5/7
n = 1
n = 1
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