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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x^2*(12-((x^2)/x)) = 0
6*x^2*(12-x) = 0
( 12-x )
12-x = 0 // - 12
-x = -12 // * -1
x = 12
( 6*x^2 )
6*x^2 = 0 // : 6
x^2 = 0
x = 0
x in { 0}
x = 12
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