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n in (-oo:+oo)
(5*n)/3-(2/7) = 64/21 // - 64/21
(5*n)/3-(2/7)-(64/21) = 0
(5*n)/3-2/7-64/21 = 0
5/3*n-10/3 = 0 // + 10/3
5/3*n = 10/3 // : 5/3
n = 10/3/5/3
n = 2
n = 2
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