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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1.68/w = 7/12 // - 7/12
1.68/w-(7/12) = 0
1.68/w-7/12 = 0
1.68*w^-1 = 7/12 // : 1.68
w^-1 = 0.34722222
-1 < 0
1/(w^1) = 0.34722222 // * w^1
1 = 0.34722222*w^1 // : 0.34722222
2.88000002 = w^1
w = 2.88000002
w = 2.88000002
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