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n in (-oo:+oo)
(5/6)*n-5*n+1/2 = -79/42 // + -79/42
(5/6)*n-5*n+1/2-(-79/42) = 0
(5/6)*n-5*n+1/2+79/42 = 0
50/21-25/6*n = 0 // - 50/21
-25/6*n = -50/21 // : -25/6
n = -50/21/(-25/6)
n = 4/7
n = 4/7
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