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n in (-oo:+oo)
(3/7)*n+8/9 = 305/252 // - 305/252
(3/7)*n+8/9-(305/252) = 0
(3/7)*n+8/9-305/252 = 0
3/7*n-9/28 = 0 // + 9/28
3/7*n = 9/28 // : 3/7
n = 9/28/3/7
n = 3/4
n = 3/4
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