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n in (-oo:+oo)
(4*n)/3-(5/7) = 97/21 // - 97/21
(4*n)/3-(5/7)-(97/21) = 0
(4*n)/3-5/7-97/21 = 0
4/3*n-16/3 = 0 // + 16/3
4/3*n = 16/3 // : 4/3
n = 16/3/4/3
n = 4
n = 4
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