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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w^2*(7/w-w) = 0
w^2*(7*w^-1-w) = 0
7*w^-1-w = 0
w^-1*(7-w^2) = 0
-1*w^2 = -7 // : -1
w^2 = 7
w^2 = 7 // ^ 1/2
abs(w) = 7^(1/2)
w = 7^(1/2) or w = -7^(1/2)
w^-1*(w-7^(1/2))*(w+7^(1/2)) = 0
w^-1*w^2*(w-7^(1/2))*(w+7^(1/2)) = 0
( w+7^(1/2) )
w+7^(1/2) = 0 // - 7^(1/2)
w = -7^(1/2)
( w-7^(1/2) )
w-7^(1/2) = 0 // + 7^(1/2)
w = 7^(1/2)
( w^-1 )
1*w^-1 = 0 // : 1
w^-1 = 0
w naleu017Cy do O
( w^2 )
1*w^2 = 0 // : 1
w^2 = 0
w = 0
w in { 0}
w in { -7^(1/2), 7^(1/2) }
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