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D( x )
4*x+24 = 0
4*x+24 = 0
4*x+24 = 0
4*x+24 = 0 // - 24
4*x = -24 // : 4
x = -24/4
x = -6
x in (-oo:-6) U (-6:+oo)
(x^2+6*x)/(4*x+24) = x // - x
(x^2+6*x)/(4*x+24)-x = 0
(x^2+6*x)/(4*x+24)+(-x*(4*x+24))/(4*x+24) = 0
x^2-x*(4*x+24)+6*x = 0
-3*x^2-18*x = 0
-3*x^2-18*x = 0
-3*x*(x+6) = 0
x+6 = 0 // - 6
x = -6
-3*x*(x+6) = 0
(-3*x*(x+6))/(4*x+24) = 0
(-3*x*(x+6))/(4*x+24) = 0 // * 4*x+24
-3*x*(x+6) = 0
( -3*x )
-3*x = 0 // : -3
x = 0
( x+6 )
x+6 = 0 // - 6
x = -6
x in { -6}
x = 0
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