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D( x )
(1/2)*x = 0
(1/2)*x < 0
(1/2)*x = 0
(1/2)*x = 0
1/2*x = 0 // : 1/2
x = 0
(1/2)*x < 0
(1/2)*x < 0
1/2*x+0 < 0 // - 0
1/2*x < 0 // : 1/2
x < 0/1/2
x < 0
x in (0:+oo)
1/14-((1/2)*x)^(-1/2) = 0
-(1/2)^(-1/2)*x^(-1/2) = -1/14 // : -(1/2)^(-1/2)
x^(-1/2) = 1/14/((1/2)^(-1/2))
-1/2 < 0
1/(x^(1/2)) = 1/14/((1/2)^(-1/2)) // * x^(1/2)
1 = (1/14/((1/2)^(-1/2)))*x^(1/2) // : 1/14/((1/2)^(-1/2))
14*(1/2)^(-1/2) = x^(1/2)
x^(1/2) = 14*(1/2)^(-1/2) // ^ 2
x = 392
x = 392
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