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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2/w+2 = -7 // + 7
2/w+2+7 = 0
2*w^-1 = -9 // : 2
w^-1 = -9/2
-1 < 0
1/(w^1) = -9/2 // * w^1
1 = -9/2*w^1 // : -9/2
-2/9 = w^1
w = -2/9
w = -2/9
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