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