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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(4/w)-2+1 = w-(3/w)+2 // - w-(3/w)+2
w-w-(4/w)+3/w-2-2+1 = 0
w-w-4*w^-1+3/w-2-2+1 = 0
-1*w^-1 = 3 // : -1
w^-1 = -3
-1 < 0
1/(w^1) = -3 // * w^1
1 = -3*w^1 // : -3
-1/3 = w^1
w = -1/3
w = -1/3
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