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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x+1 = x-(2/(-3)) // - x-(2/(-3))
(2*x)/x-x+2/(-3)+1 = 0
7/3-x = 0 // - 7/3
-x = -7/3 // * -1
x = 7/3
x = 7/3
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