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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/x = (7/7)/5 // - (7/7)/5
25/x-((7/7)/5) = 0
25/x-1/5 = 0
25*x^-1 = 1/5 // : 25
x^-1 = 1/125
-1 < 0
1/(x^1) = 1/125 // * x^1
1 = 1/125*x^1 // : 1/125
125 = x^1
x = 125
x = 125
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