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D( x )
3*x+9 = 0
3*x+9 = 0
3*x+9 = 0
3*x+9 = 0 // - 9
3*x = -9 // : 3
x = -9/3
x = -3
x in (-oo:-3) U (-3:+oo)
x*((x^2-9)/2)*(6/(3*x+9)) = 0
(6*x*(x^2-9))/(2*(3*x+9)) = 0
( x )
x = 0
( x^2-9 )
1*x^2 = 9 // : 1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { -3}
x in { 0, 3 }
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