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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
37.7/x = 0.69 // - 0.69
37.7/x-0.69 = 0
37.7*x^-1 = 0.69 // : 37.7
x^-1 = 0.01830239
-1 < 0
1/(x^1) = 0.01830239 // * x^1
1 = 0.01830239*x^1 // : 0.01830239
54.637673 = x^1
x = 54.637673
x = 54.637673
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