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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
40/w = 50/3 // - 50/3
40/w-(50/3) = 0
40/w-50/3 = 0
40*w^-1 = 50/3 // : 40
w^-1 = 5/12
-1 < 0
1/(w^1) = 5/12 // * w^1
1 = 5/12*w^1 // : 5/12
12/5 = w^1
w = 12/5
w = 12/5
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