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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x = 13/100 // - 13/100
y/x-(13/100) = 0
y/x-13/100 = 0
x^-1*y = 13/100 // : y
x^-1 = 13/100/y
-1 < 0
1/(x^1) = 13/100/y // * x^1
1 = x^1*(13/100/y) // : 13/100/y
100/13*y = x^1
x = 100/13*y
x = 100/13*y
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