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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25 = 35.6/x // - 35.6/x
25-(35.6/x) = 0
25-35.6*x^-1 = 0
-35.6*x^-1 = -25 // : -35.6
x^-1 = 0.70224719
-1 < 0
1/(x^1) = 0.70224719 // * x^1
1 = 0.70224719*x^1 // : 0.70224719
1.424 = x^1
x = 1.424
x = 1.424
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