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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
7/w-2 = 5/w-8+1 // - 5/w-8+1
7/w-(5/w)-2-1+8 = 0
7/w-5*w^-1-2-1+8 = 0
2*w^-1 = -5 // : 2
w^-1 = -5/2
-1 < 0
1/(w^1) = -5/2 // * w^1
1 = -5/2*w^1 // : -5/2
-2/5 = w^1
w = -2/5
w = -2/5
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