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n in (-oo:+oo)
(4/7)*n-(9/10) = -463/70 // + -463/70
(4/7)*n-(9/10)-(-463/70) = 0
(4/7)*n-9/10+463/70 = 0
4/7*n+40/7 = 0 // - 40/7
4/7*n = -40/7 // : 4/7
n = -40/7/4/7
n = -10
n = -10
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