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D( x )
0.15-x = 0
0.15-x = 0
0.15-x = 0
0.15-x = 0 // - 0.15
-x = -0.15 // * -1
x = 0.15
x in (-oo:0.15) U (0.15:+oo)
((2*x^2)/(0.15-x))*(0.15-x)-(4.5*10^-3) = 0
((2*x^2)/(0.15-x))*(0.15-x)-4.5*10^-3 = 0
2*x^2-0.0045 = 0
2*x^2 = 0.0045 // : 2
x^2 = 0.00225
x^2 = 0.00225 // ^ 1/2
abs(x) = 0.00225^(1/2)
x = 0.00225^(1/2) or x = -0.00225^(1/2)
x in { 0.00225^(1/2), -0.00225^(1/2) }
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