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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
10*x^(1/4)+5*x^(-3/4) = 0
t_1 = x^(1/4)
10*t_1^1+5*t_1^-3 = 0
10*t_1+5*t_1^-3 = 0
5*t_1*(t_1^-4+2) = 0
1*t_1^-4 = -2 // : 1
t_1^-4 = -2
-4 < 0
1/(t_1^4) = -2 // * t_1^4
1 = -2*t_1^4 // : -2
-1/2 = t_1^4
5*t_1 = 0
5*t_1 = 0 // : 5
t_1 = 0
t_1 = 0
x^(1/4)+0 = 0
x^(1/4) = 0
1*x^(1/4) = 0 // : 1
x^(1/4) = 0
x = 0
x in { 0}
x belongs to the empty set
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