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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-((5*(24/20)*x)/x)-6 = 0
4*x-6-6 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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