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D( v )
3*v^3 = 0
3*v^3 = 0
3*v^3 = 0
3*v^3 = 0 // : 3
v^3 = 0
v = 0
v in (-oo:0) U (0:+oo)
6*v^7-((9*v^4)/(3*v^3)) = 0
6*v^7-3*v = 0
6*v^7-3*v = 0
3*v*(2*v^6-1) = 0
2*v^6 = 1 // : 2
v^6 = 1/2
v^6 = 1/2 // ^ 1/6
abs(v) = (1/2)^(1/6)
v = (1/2)^(1/6) or v = -(1/2)^(1/6)
3*v = 0
3*v = 0 // : 3
v = 0
v in { 0}
v in { (1/2)^(1/6), -(1/2)^(1/6) }
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