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n in (-oo:+oo)
(1/2)*n+1/7 = 4/77 // - 4/77
(1/2)*n+1/7-(4/77) = 0
(1/2)*n+1/7-4/77 = 0
1/2*n+1/11 = 0 // - 1/11
1/2*n = -1/11 // : 1/2
n = -1/11/1/2
n = -2/11
n = -2/11
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