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