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n in (-oo:+oo)
(2*n)/3-(6/7) = 52/21 // - 52/21
(2*n)/3-(6/7)-(52/21) = 0
(2*n)/3-6/7-52/21 = 0
2/3*n-10/3 = 0 // + 10/3
2/3*n = 10/3 // : 2/3
n = 10/3/2/3
n = 5
n = 5
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