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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
313/x = 90/100 // - 90/100
313/x-(90/100) = 0
313/x-9/10 = 0
313*x^-1 = 9/10 // : 313
x^-1 = 9/3130
-1 < 0
1/(x^1) = 9/3130 // * x^1
1 = 9/3130*x^1 // : 9/3130
3130/9 = x^1
x = 3130/9
x = 3130/9
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