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D( x )
5*v^3*x^2 = 0
5*v^3*x^2 = 0
5*v^3*x^2 = 0
5*v^3*x^2 = 0 // : 5*v^3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
15*v^2*w^2-((25*v)/(5*v^3*x^2)) = 0
15*v^2*w^2-5*v^-2*x^-2 = 0
-5*v^-2*x^-2 = -(15*v^2*w^2) // : -5*v^-2
x^-2 = 3*v^4*w^2
-2 < 0
1/(x^2) = 3*v^4*w^2 // * x^2
1 = 3*v^4*w^2*x^2 // : 3*v^4*w^2
1/(3*v^4*w^2) = x^2
x^2 = 1/(3*v^4*w^2) // ^ 1/2
abs(x) = 1/(3^(1/2)*v^2*w)
x = 1/(3^(1/2)*v^2*w) or x = -(1/(3^(1/2)*v^2*w))
x in { 1/(3^(1/2)*v^2*w), -(1/(3^(1/2)*v^2*w)) }
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