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n in (-oo:+oo)
(5*n)/3-(6/7) = 87/21 // - 87/21
(5*n)/3-(6/7)-(87/21) = 0
(5*n)/3-6/7-29/7 = 0
5/3*n-5 = 0 // + 5
5/3*n = 5 // : 5/3
n = 5/5/3
n = 3
n = 3
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