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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 95/100 // - 95/100
2/x-(95/100) = 0
2/x-19/20 = 0
2*x^-1 = 19/20 // : 2
x^-1 = 19/40
-1 < 0
1/(x^1) = 19/40 // * x^1
1 = 19/40*x^1 // : 19/40
40/19 = x^1
x = 40/19
x = 40/19
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