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D( x )
((9*v^2)/3)*((x^1)/2) = 0
((9*v^2)/3)*((x^1)/2) = 0
((9*v^2)/3)*((x^1)/2) = 0
((9*v^2)/3)*(x/2) = 0
3/2*v^2*x = 0 // : 3/2*v^2
x = 0
x in (-oo:0) U (0:+oo)
(((3*v^5)/3)*x^2)/(((9*v^2)/3)*((x^1)/2)) = 0
(((3*v^5)/3)*x^2)/(((9*v^2)/3)*(x/2)) = 0
2/3*v^3*x = 0 // : 2/3*v^3
x = 0
x in { 0}
x belongs to the empty set
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