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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
15/w = 300 // - 300
15/w-300 = 0
15*w^-1 = 300 // : 15
w^-1 = 20
-1 < 0
1/(w^1) = 20 // * w^1
1 = 20*w^1 // : 20
1/20 = w^1
w = 1/20
w = 1/20
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