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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
52/13 = 175/x // - 175/x
52/13-(175/x) = 0
52/13-175*x^-1 = 0
-175*x^-1 = -4 // : -175
x^-1 = 4/175
-1 < 0
1/(x^1) = 4/175 // * x^1
1 = 4/175*x^1 // : 4/175
175/4 = x^1
x = 175/4
x = 175/4
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