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D( w )
4*w+4 = 0
4*w+4 = 0
4*w+4 = 0
4*w+4 = 0 // - 4
4*w = -4 // : 4
w = -4/4
w = -1
w in (-oo:-1) U (-1:+oo)
(20*w^3)/(4*w+4) = 0
20*w^3 = 0 // : 20
w^3 = 0
w = 0
w = 0
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