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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 5.25 // - 5.25
1/x-5.25 = 0
1*x^-1 = 5.25 // : 1
x^-1 = 5.25
-1 < 0
1/(x^1) = 5.25 // * x^1
1 = 5.25*x^1 // : 5.25
0.19047619 = x^1
x = 0.19047619
x = 0.19047619
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