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n in (-oo:+oo)
(5/7)*n-((4/5)*n)+6 = 419/70 // - 419/70
(5/7)*n-((4/5)*n)-(419/70)+6 = 0
(5/7)*n+(-4/5)*n-419/70+6 = 0
1/70-3/35*n = 0 // - 1/70
-3/35*n = -1/70 // : -3/35
n = -1/70/(-3/35)
n = 1/6
n = 1/6
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