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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
28/w = 40/53 // - 40/53
28/w-(40/53) = 0
28/w-40/53 = 0
28*w^-1 = 40/53 // : 28
w^-1 = 10/371
-1 < 0
1/(w^1) = 10/371 // * w^1
1 = 10/371*w^1 // : 10/371
371/10 = w^1
w = 371/10
w = 371/10
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