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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
2-(6.75*x^(-1/2)) = 0
2-6.75*x^(-1/2) = 0
-6.75*x^(-1/2) = -2 // : -6.75
x^(-1/2) = 0.2962963
-1/2 < 0
1/(x^(1/2)) = 0.2962963 // * x^(1/2)
1 = 0.2962963*x^(1/2) // : 0.2962963
3.37499996 = x^(1/2)
x^(1/2) = 3.37499996 // ^ 2
x = 3.37499996^2
x = 3.37499996^2
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