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D( x )
10*x = 0
2*x-1 = 0
5*x^2 = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
5*x^2 = 0
5*x^2 = 0
5*x^2 = 0 // : 5
x^2 = 0
x = 0
x in (-oo:0) U (0:1/2) U (1/2:+oo)
(((6*x-3)/(5*x^2))/(2*x-1))/(10*x) = 0
(6*x-3)/(5*10*x*x^2*(2*x-1)) = 0
6*x-3 = 0 // + 3
6*x = 3 // : 6
x = 3/6
x = 1/2
x in { 1/2}
x belongs to the empty set
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