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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 86/100 // - 86/100
2/x-(86/100) = 0
2/x-43/50 = 0
2*x^-1 = 43/50 // : 2
x^-1 = 43/100
-1 < 0
1/(x^1) = 43/100 // * x^1
1 = 43/100*x^1 // : 43/100
100/43 = x^1
x = 100/43
x = 100/43
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