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D( v )
2*v^2 = 0
2*v^2 = 0
2*v^2 = 0
2*v^2 = 0 // : 2
v^2 = 0
v = 0
v in (-oo:0) U (0:+oo)
(14*v^5-(4*v^4))/(2*v^2) = 0
(14*v^5-4*v^4)/(2*v^2) = 0
14*v^5-4*v^4 = 0
2*v^4*(7*v-2) = 0
7*v-2 = 0 // + 2
7*v = 2 // : 7
v = 2/7
2*v^4*(v-2/7) = 0
(2*v^4*(v-2/7))/(2*v^2) = 0
( 2*v^4 )
2*v^4 = 0 // : 2
v^4 = 0
v = 0
( v-2/7 )
v-2/7 = 0 // + 2/7
v = 2/7
v in { 0}
v = 2/7
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