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