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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(1*2.6)/w = 3.5 // - 3.5
(1*2.6)/w-3.5 = 0
2.6/w-3.5 = 0
2.6*w^-1 = 3.5 // : 2.6
w^-1 = 1.34615385
-1 < 0
1/(w^1) = 1.34615385 // * w^1
1 = 1.34615385*w^1 // : 1.34615385
0.74285714 = w^1
w = 0.74285714
w = 0.74285714
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