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