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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/21 = 16/x // - 16/x
5/21-(16/x) = 0
5/21-16*x^-1 = 0
-16*x^-1 = -5/21 // : -16
x^-1 = 5/336
-1 < 0
1/(x^1) = 5/336 // * x^1
1 = 5/336*x^1 // : 5/336
336/5 = x^1
x = 336/5
x = 336/5
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