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D( w )
11*w = 0
w = 0
11*w = 0
11*w = 0
11*w = 0 // : 11
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(w-4)/w-((6*w-23)/(11*w)) = 0
(w-4)/w+(-1*(6*w-23))/(11*w) = 0
(11*w*(w-4))/(11*w*w)+(-1*w*(6*w-23))/(11*w*w) = 0
11*w*(w-4)-1*w*(6*w-23) = 0
5*w^2-21*w = 0
5*w^2-21*w = 0
w*(5*w-21) = 0
5*w-21 = 0 // + 21
5*w = 21 // : 5
w = 21/5
w*(w-21/5) = 0
(w*(w-21/5))/(11*w*w) = 0
(w*(w-21/5))/(11*w*w) = 0 // * 11*w*w
w*(w-21/5) = 0
( w-21/5 )
w-21/5 = 0 // + 21/5
w = 21/5
( w )
w = 0
w in { 0}
w = 21/5
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