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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
45/w = 3/16 // - 3/16
45/w-(3/16) = 0
45/w-3/16 = 0
45*w^-1 = 3/16 // : 45
w^-1 = 1/240
-1 < 0
1/(w^1) = 1/240 // * w^1
1 = 1/240*w^1 // : 1/240
240 = w^1
w = 240
w = 240
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