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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/25 = 36/x // - 36/x
24/25-(36/x) = 0
24/25-36*x^-1 = 0
-36*x^-1 = -24/25 // : -36
x^-1 = 2/75
-1 < 0
1/(x^1) = 2/75 // * x^1
1 = 2/75*x^1 // : 2/75
75/2 = x^1
x = 75/2
x = 75/2
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