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D( w )
w-((6/22)*w) = 0
w-((6/22)*w) = 0
w-((6/22)*w) = 0
w+(-3/11)*w = 0
8/11*w = 0 // : 8/11
w = 0
w in (-oo:0) U (0:+oo)
(7*w-(42/4))/(w-((6/22)*w)) = 0
(7*w-21/2)/(w+(-3/11)*w) = 0
(7*w-21/2)/(8/11*w) = 0
7*w-21/2 = 0 // + 21/2
7*w = 21/2 // : 7
w = 21/2/7
w = 3/2
w = 3/2
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