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D( x )
(6*x)/(25^3) = 0
(6*x)/(25^3) = 0
(6*x)/(25^3) = 0
6/15625*x = 0 // : 6/15625
x = 0
x in (-oo:0) U (0:+oo)
(x^5*((2*x^7)/5))/((6*x)/(25^3)) = 0
3125/3*x^11 = 0 // : 3125/3
x^11 = 0
x = 0
x in { 0}
x belongs to the empty set
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