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D( x )
(3*x+2)*(1.5*x-1) = 0
(3*x+2)*(1.5*x-1) = 0
(3*x+2)*(1.5*x-1) = 0
( 1.5*x-1 )
1.5*x-1 = 0 // + 1
1.5*x = 1 // : 1.5
x = 1/1.5
x = 0.66666667
( 3*x+2 )
3*x+2 = 0 // - 2
3*x = -2 // : 3
x = -2/3
x in (-oo:-2/3) U (-2/3:0.66666667) U (0.66666667:+oo)
((9*x^2-4)*(9*x^2+4))/((3*x+2)*(1.5*x-1)) = 0
( 9*x^2+4 )
9*x^2 = -4 // : 9
x^2 = -4/9
( 9*x^2-4 )
9*x^2 = 4 // : 9
x^2 = 4/9
x^2 = 4/9 // ^ 1/2
abs(x) = 2/3
x = 2/3 or x = -2/3
x in { 2/3}
x in { -2/3}
x belongs to the empty set
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