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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/16 = 3.75/x // - 3.75/x
1/16-(3.75/x) = 0
1/16-3.75*x^-1 = 0
-3.75*x^-1 = -1/16 // : -3.75
x^-1 = 0.01666667
-1 < 0
1/(x^1) = 0.01666667 // * x^1
1 = 0.01666667*x^1 // : 0.01666667
59.999988 = x^1
x = 59.999988
x = 59.999988
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