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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((8/3)/1)/5 = 45/x // - 45/x
((8/3)/1)/5-(45/x) = 0
(8/3)/5-45*x^-1 = 0
-45*x^-1 = -8/15 // : -45
x^-1 = 8/675
-1 < 0
1/(x^1) = 8/675 // * x^1
1 = 8/675*x^1 // : 8/675
675/8 = x^1
x = 675/8
x = 675/8
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