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