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v in (-oo:+oo)
14*v^4-(v^2*((4*v^3)/2)) = 0
14*v^4-2*v^5 = 0
14*v^4-2*v^5 = 0
2*v^4*(7-v) = 0
7-v = 0 // - 7
-v = -7 // * -1
v = 7
2*v^4 = 0
2*v^4 = 0 // : 2
v^4 = 0
v = 0
v in { 7, 0 }
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