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D( x )
9-(3*x) = 0
(x^2+3*x)/6 = 0
9-(3*x) = 0
9-(3*x) = 0
9-3*x = 0
9-3*x = 0 // - 9
-3*x = -9 // : -3
x = -9/(-3)
x = 3
(x^2+3*x)/6 = 0
(x^2+3*x)/6 = 0
x^2+3*x = 0
x*(x+3) = 0
x+3 = 0 // - 3
x = -3
x*(x+3) = 0
(x*(x+3))/6 = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x )
x = 0
x in (-oo:-3) U (-3:0) U (0:3) U (3:+oo)
(((3*x^2-27)/4)*((8*x^2)/(9-(3*x))))/((x^2+3*x)/6) = 0
(((3*x^2-27)/4)*((8*x^2)/(9-3*x)))/((x^2+3*x)/6) = 0
(6*8*x^2*(3*x^2-27))/(4*(9-3*x)*(x^2+3*x)) = 0
x^2+3*x = 0
x*(x+3) = 0
x+3 = 0 // - 3
x = -3
x*(x+3) = 0
(6*8*x^2*(3*x^2-27))/(4*x*(9-3*x)*(x+3)) = 0
( 3*x^2-27 )
3*x^2 = 27 // : 3
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
( 8*x^2 )
8*x^2 = 0 // : 8
x^2 = 0
x = 0
x in { 3}
x in { -3}
x in { 0}
x belongs to the empty set
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