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n in (-oo:+oo)
(2*n)/3-(3/7) = 0
(2*n)/3-3/7 = 0
2/3*n-3/7 = 0 // + 3/7
2/3*n = 3/7 // : 2/3
n = 3/7/2/3
n = 9/14
n = 9/14
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