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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3/w = 7/28 // - 7/28
3/w-(7/28) = 0
3/w-1/4 = 0
3*w^-1 = 1/4 // : 3
w^-1 = 1/12
-1 < 0
1/(w^1) = 1/12 // * w^1
1 = 1/12*w^1 // : 1/12
12 = w^1
w = 12
w = 12
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