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D( x )
x^2-4 = 0
x-3 = 0
x^2-4 = 0
x^2-4 = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:-2) U (-2:2) U (2:3) U (3:+oo)
(((x-2)/(x-3))*(4*x-6))/(x^2-4) = 0
((x-2)*(4*x-6))/((x-3)*(x^2-4)) = 0
( 4*x-6 )
4*x-6 = 0 // + 6
4*x = 6 // : 4
x = 6/4
x = 3/2
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 2}
x = 3/2
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