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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
7/12 = 49/w // - 49/w
7/12-(49/w) = 0
7/12-49*w^-1 = 0
-49*w^-1 = -7/12 // : -49
w^-1 = 1/84
-1 < 0
1/(w^1) = 1/84 // * w^1
1 = 1/84*w^1 // : 1/84
84 = w^1
w = 84
w = 84
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