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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/w-(((5*w)/5)*w)-5+4 = 0
w/w-w^2-5+4 = 0
-1*w^2 = 0 // : -1
w^2 = 0
w = 0
w in { 0}
w belongs to the empty set
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