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