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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-((4*x)/x)+4/3+4 = x // - x
3*x-x-((4*x)/x)+4/3+4 = 0
3*x-x+4/3-4+4 = 0
2*x+4/3 = 0 // - 4/3
2*x = -4/3 // : 2
x = -4/3/2
x = -2/3
x = -2/3
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