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