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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
24 = 49/w // - 49/w
24-(49/w) = 0
24-49*w^-1 = 0
-49*w^-1 = -24 // : -49
w^-1 = 24/49
-1 < 0
1/(w^1) = 24/49 // * w^1
1 = 24/49*w^1 // : 24/49
49/24 = w^1
w = 49/24
w = 49/24
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