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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
1/u+6 = -6 // + 6
1/u+6+6 = 0
1*u^-1 = -12 // : 1
u^-1 = -12
-1 < 0
1/(u^1) = -12 // * u^1
1 = -12*u^1 // : -12
-1/12 = u^1
u = -1/12
u = -1/12
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