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n in (-oo:+oo)
(3/7)*n+4/9 = -80/63 // + -80/63
(3/7)*n+4/9-(-80/63) = 0
(3/7)*n+4/9+80/63 = 0
3/7*n+12/7 = 0 // - 12/7
3/7*n = -12/7 // : 3/7
n = -12/7/3/7
n = -4
n = -4
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