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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8/3)*x-6 = (3*x)/x-2 // - (3*x)/x-2
(8/3)*x-((3*x)/x)-6+2 = 0
(8/3)*x-6-3+2 = 0
8/3*x-7 = 0 // + 7
8/3*x = 7 // : 8/3
x = 7/8/3
x = 21/8
x = 21/8
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