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n in (-oo:+oo)
17/42 = 4*n-((3/7)*n)+1 // - 4*n-((3/7)*n)+1
(3/7)*n-(4*n)+17/42-1 = 0
(3/7)*n-4*n+17/42-1 = 0
-25/7*n-25/42 = 0 // + 25/42
-25/7*n = 25/42 // : -25/7
n = 25/42/(-25/7)
n = -1/6
n = -1/6
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