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n in (-oo:+oo)
(9/5)*n-((13/7)*n)+1 = 0
(9/5)*n+(-13/7)*n+1 = 0
1-2/35*n = 0 // - 1
-2/35*n = -1 // : -2/35
n = -1/(-2/35)
n = 35/2
n = 35/2
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