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n in (-oo:+oo)
(3/7)*n+(2/7)*n+2/9 = 419/63 // - 419/63
(3/7)*n+(2/7)*n+2/9-(419/63) = 0
(3/7)*n+(2/7)*n+2/9-419/63 = 0
5/7*n-45/7 = 0 // + 45/7
5/7*n = 45/7 // : 5/7
n = 45/7/5/7
n = 9
n = 9
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