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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
12/w = 36/63 // - 36/63
12/w-(36/63) = 0
12/w-4/7 = 0
12*w^-1 = 4/7 // : 12
w^-1 = 1/21
-1 < 0
1/(w^1) = 1/21 // * w^1
1 = 1/21*w^1 // : 1/21
21 = w^1
w = 21
w = 21
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