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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(2*x^2)/(2*x) = 64 // - 64
(2*x^2)/(2*x)-64 = 0
x-64 = 0 // + 64
x = 64
x = 64
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