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D( w )
10*w = 0
4*w = 0
10*w = 0
10*w = 0
10*w = 0 // : 10
w = 0
4*w = 0
4*w = 0
4*w = 0 // : 4
w = 0
w in (-oo:0) U (0:+oo)
3/(4*w)+3/(10*w) = 0
21/20*w^-1 = 0 // : 21/20
w^-1 = 0
w naleu017Cy do O
w belongs to the empty set
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