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D( x )
x < 0
x < 0
x in <0:+oo)
3*x^(1/2) = 12 // - 12
3*x^(1/2)-12 = 0
3*x^(1/2) = 12 // : 3
x^(1/2) = 4
x^(1/2) = 4 // ^ 2
x = 16
x = 16
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