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D( x )
10*x = 0
4*x^2 = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
4*x^2 = 0
4*x^2 = 0
4*x^2 = 0 // : 4
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x+5)/(4*x^2)+(2*x-5)/(10*x) = 0
(10*x*(2*x+5))/(4*10*x*x^2)+(4*x^2*(2*x-5))/(4*10*x*x^2) = 0
10*x*(2*x+5)+4*x^2*(2*x-5) = 0
8*x^3+50*x = 0
8*x^3+50*x = 0
2*x*(4*x^2+25) = 0
4*x^2 = -25 // : 4
x^2 = -25/4
2*x = 0
(2*x)/(4*10*x*x^2) = 0
(2*x)/(4*10*x*x^2) = 0 // * 4*10*x*x^2
2*x = 0
2*x = 0 // : 2
x = 0
x in { 0}
x belongs to the empty set
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