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n in (-oo:+oo)
(4/7)*n-(3/10) = -461/70 // + -461/70
(4/7)*n-(3/10)-(-461/70) = 0
(4/7)*n-3/10+461/70 = 0
4/7*n+44/7 = 0 // - 44/7
4/7*n = -44/7 // : 4/7
n = -44/7/4/7
n = -11
n = -11
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