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n in (-oo:+oo)
(5/7)*n+7/9 = (6/7)*n+481/630 // - (6/7)*n+481/630
(5/7)*n-((6/7)*n)+7/9-(481/630) = 0
(5/7)*n+(-6/7)*n+7/9-481/630 = 0
1/70-1/7*n = 0 // - 1/70
-1/7*n = -1/70 // : -1/7
n = -1/70/(-1/7)
n = 1/10
n = 1/10
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