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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
22/8 = 55/w // - 55/w
22/8-(55/w) = 0
22/8-55*w^-1 = 0
-55*w^-1 = -11/4 // : -55
w^-1 = 1/20
-1 < 0
1/(w^1) = 1/20 // * w^1
1 = 1/20*w^1 // : 1/20
20 = w^1
w = 20
w = 20
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