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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
882/w = 42 // - 42
882/w-42 = 0
882*w^-1 = 42 // : 882
w^-1 = 1/21
-1 < 0
1/(w^1) = 1/21 // * w^1
1 = 1/21*w^1 // : 1/21
21 = w^1
w = 21
w = 21
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