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D( u )
u-6 = 0
u-6 = 0
u-6 = 0
u-6 = 0 // + 6
u = 6
u in (-oo:6) U (6:+oo)
1/(u-6) = 8 // - 8
1/(u-6)-8 = 0
1/(u-6)+(-8*(u-6))/(u-6) = 0
1-8*(u-6) = 0
49-8*u = 0
(49-8*u)/(u-6) = 0
(49-8*u)/(u-6) = 0 // * u-6
49-8*u = 0
49-8*u = 0 // - 49
-8*u = -49 // : -8
u = -49/(-8)
u = 49/8
u = 49/8
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