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D( x )
(2*x-1)*(5*x+2) = 0
(2*x-1)*(5*x+2) = 0
(2*x-1)*(5*x+2) = 0
( 2*x-1 )
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
( 5*x+2 )
5*x+2 = 0 // - 2
5*x = -2 // : 5
x = -2/5
x in (-oo:-2/5) U (-2/5:1/2) U (1/2:+oo)
(3*x^2-3)/((2*x-1)*(5*x+2)) = 0
3*x^2 = 3 // : 3
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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