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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((5*x-7)^4)/5)/x = 0
((5*x-7)^4)/(5*x) = 0
5*x-7 = 0 // + 7
5*x = 7 // : 5
x = 7/5
x in { 7/5, 7/5, 7/5, 7/5 }
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