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n in (-oo:+oo)
(4/5)*n+1/7 = 13/35 // - 13/35
(4/5)*n+1/7-(13/35) = 0
(4/5)*n+1/7-13/35 = 0
4/5*n-8/35 = 0 // + 8/35
4/5*n = 8/35 // : 4/5
n = 8/35/4/5
n = 2/7
n = 2/7
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