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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5/5.25 = 16/x // - 16/x
3.5/5.25-(16/x) = 0
3.5/5.25-16*x^-1 = 0
-16*x^-1 = -0.66666667 // : -16
x^-1 = 0.04166667
-1 < 0
1/(x^1) = 0.04166667 // * x^1
1 = 0.04166667*x^1 // : 0.04166667
23.99999808 = x^1
x = 23.99999808
x = 23.99999808
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