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D( x )
4*x+16 = 0
2*x^2-2 = 0
4*x+16 = 0
4*x+16 = 0
4*x+16 = 0 // - 16
4*x = -16 // : 4
x = -16/4
x = -4
2*x^2-2 = 0
2*x^2-2 = 0
2*x^2 = 2 // : 2
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in (-oo:-4) U (-4:-1) U (-1:1) U (1:+oo)
(((6*x+6)/(4*x+16))*(2*x+8))/(2*x^2-2) = 0
((6*x+6)*(2*x+8))/((4*x+16)*(2*x^2-2)) = 0
( 2*x+8 )
2*x+8 = 0 // - 8
2*x = -8 // : 2
x = -8/2
x = -4
( 6*x+6 )
6*x+6 = 0 // - 6
6*x = -6 // : 6
x = -6/6
x = -1
x in { -4}
x in { -1}
x belongs to the empty set
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