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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
64/130 = 55/x // - 55/x
64/130-(55/x) = 0
64/130-55*x^-1 = 0
-55*x^-1 = -32/65 // : -55
x^-1 = 32/3575
-1 < 0
1/(x^1) = 32/3575 // * x^1
1 = 32/3575*x^1 // : 32/3575
3575/32 = x^1
x = 3575/32
x = 3575/32
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