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D( w )
w+4 = 0
w+4 = 0
w+4 = 0
w+4 = 0 // - 4
w = -4
w in (-oo:-4) U (-4:+oo)
(w+3)/(w+4)-2 = 0
(w+3)/(w+4)+(-2*(w+4))/(w+4) = 0
w-2*(w+4)+3 = 0
-w-5 = 0
(-w-5)/(w+4) = 0
(-w-5)/(w+4) = 0 // * w+4
-w-5 = 0
-w-5 = 0 // + 5
-w = 5 // * -1
w = -5
w = -5
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