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v in (-oo:+oo)
14*v^7-(((8*v^3)/2)*v^3) = 0
14*v^7-4*v^6 = 0
14*v^7-4*v^6 = 0
2*v^6*(7*v-2) = 0
7*v-2 = 0 // + 2
7*v = 2 // : 7
v = 2/7
2*v^6 = 0
2*v^6 = 0 // : 2
v^6 = 0
v = 0
v in { 2/7, 0 }
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