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n in (-oo:+oo)
(4/7)*n+3 = 239/77 // - 239/77
(4/7)*n-(239/77)+3 = 0
(4/7)*n-239/77+3 = 0
4/7*n-8/77 = 0 // + 8/77
4/7*n = 8/77 // : 4/7
n = 8/77/4/7
n = 2/11
n = 2/11
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