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n in (-oo:+oo)
(5/7)*n-2 = 10/7-n // - 10/7-n
(5/7)*n+n-(10/7)-2 = 0
(5/7)*n+n-10/7-2 = 0
12/7*n-24/7 = 0 // + 24/7
12/7*n = 24/7 // : 12/7
n = 24/7/12/7
n = 2
n = 2
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