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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(2/w)+1+6 = w+2/w+3 // - w+2/w+3
w-w-(2/w)-(2/w)-3+1+6 = 0
w-w-2*w^-1-2*w^-1-3+1+6 = 0
-4*w^-1 = -4 // : -4
w^-1 = 1
-1 < 0
1/(w^1) = 1 // * w^1
1 = 1*w^1 // : 1
1 = w^1
w = 1
w = 1
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