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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1/w-5+6 = w/w-5 // - w/w-5
1/w-(w/w)-5+5+6 = 0
1/w-5-1+5+6 = 0
1*w^-1 = -5 // : 1
w^-1 = -5
-1 < 0
1/(w^1) = -5 // * w^1
1 = -5*w^1 // : -5
-1/5 = w^1
w = -1/5
w = -1/5
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