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n in (-oo:+oo)
(5/7)*n+6*n+4/9 = -1241/63 // + -1241/63
(5/7)*n+6*n+4/9-(-1241/63) = 0
(5/7)*n+6*n+4/9+1241/63 = 0
47/7*n+141/7 = 0 // - 141/7
47/7*n = -141/7 // : 47/7
n = -141/7/47/7
n = -3
n = -3
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