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n in (-oo:+oo)
(6/7)*n+3 = 117/35 // - 117/35
(6/7)*n-(117/35)+3 = 0
(6/7)*n-117/35+3 = 0
6/7*n-12/35 = 0 // + 12/35
6/7*n = 12/35 // : 6/7
n = 12/35/6/7
n = 2/5
n = 2/5
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