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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/16 = 19/x // - 19/x
3/16-(19/x) = 0
3/16-19*x^-1 = 0
-19*x^-1 = -3/16 // : -19
x^-1 = 3/304
-1 < 0
1/(x^1) = 3/304 // * x^1
1 = 3/304*x^1 // : 3/304
304/3 = x^1
x = 304/3
x = 304/3
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