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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*(100/x) = y // - y
2*(100/x)-y = 0
200*x^-1 = y // : 200
x^-1 = y/200
-1 < 0
1/(x^1) = y/200 // * x^1
1 = x^1*(y/200) // : y/200
200*y^-1 = x^1
x = 200*y^-1
x = 200*y^-1
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