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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
75/52 = 7/x // - 7/x
75/52-(7/x) = 0
75/52-7*x^-1 = 0
-7*x^-1 = -75/52 // : -7
x^-1 = 75/364
-1 < 0
1/(x^1) = 75/364 // * x^1
1 = 75/364*x^1 // : 75/364
364/75 = x^1
x = 364/75
x = 364/75
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