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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6.37/w-1.98 = 7.82 // - 7.82
6.37/w-7.82-1.98 = 0
6.37*w^-1 = 9.8 // : 6.37
w^-1 = 1.53846154
-1 < 0
1/(w^1) = 1.53846154 // * w^1
1 = 1.53846154*w^1 // : 1.53846154
0.65 = w^1
w = 0.65
w = 0.65
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