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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2-(1/w)+6 = 1-2/w // - 1-2/w
2-(1/w)-(-2/w)-1+6 = 0
2*w^-1-w^-1-1+2+6 = 0
1*w^-1 = -7 // : 1
w^-1 = -7
-1 < 0
1/(w^1) = -7 // * w^1
1 = -7*w^1 // : -7
-1/7 = w^1
w = -1/7
w = -1/7
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