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D( x )
2*x = 0
3*x-12 = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
3*x-12 = 0
3*x-12 = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x in (-oo:0) U (0:4) U (4:+oo)
((x^2-16)/(2*x))*(18/(3*x-12)) = 0
(18*(x^2-16))/(2*x*(3*x-12)) = 0
( 18 )
18 = 0
x belongs to the empty set
( x^2-16 )
1*x^2 = 16 // : 1
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in { 4}
x = -4
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