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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.4861111111/x = 1.3125 // - 1.3125
0.4861111111/x-1.3125 = 0
0.4861111111*x^-1 = 1.3125 // : 0.4861111111
x^-1 = 2.7
-1 < 0
1/(x^1) = 2.7 // * x^1
1 = 2.7*x^1 // : 2.7
0.37037037 = x^1
x = 0.37037037
x = 0.37037037
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