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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
2-(5/u)+6 = 6/u-2 // - 6/u-2
2-(5/u)-(6/u)+2+6 = 0
2-5*u^-1-6*u^-1+2+6 = 0
-11*u^-1 = -10 // : -11
u^-1 = 10/11
-1 < 0
1/(u^1) = 10/11 // * u^1
1 = 10/11*u^1 // : 10/11
11/10 = u^1
u = 11/10
u = 11/10
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