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n in (-oo:+oo)
(3/7)*n+2*n+1 = 24/7 // - 24/7
(3/7)*n+2*n-(24/7)+1 = 0
(3/7)*n+2*n-24/7+1 = 0
17/7*n-17/7 = 0 // + 17/7
17/7*n = 17/7 // : 17/7
n = 17/7/17/7
n = 1
n = 1
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