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n in (-oo:+oo)
(5*n)/2-(3/7) = 64/14 // - 64/14
(5*n)/2-(3/7)-(64/14) = 0
(5*n)/2-3/7-32/7 = 0
5/2*n-5 = 0 // + 5
5/2*n = 5 // : 5/2
n = 5/5/2
n = 2
n = 2
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