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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-(4/w) = 6 // - 6
-(4/w)-6 = 0
-4*w^-1-6 = 0
-4*w^-1 = 6 // : -4
w^-1 = -3/2
-1 < 0
1/(w^1) = -3/2 // * w^1
1 = -3/2*w^1 // : -3/2
-2/3 = w^1
w = -2/3
w = -2/3
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