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v in (-oo:+oo)
((v^1)/2)*v = 4 // - 4
((v^1)/2)*v-4 = 0
(v/2)*v-4 = 0
1/2*v^2 = 4 // : 1/2
v^2 = 8
v^2 = 8 // ^ 1/2
abs(v) = 2*2^(1/2)
v = 2*2^(1/2) or v = -(2*2^(1/2))
v in { 2*2^(1/2), -(2*2^(1/2)) }
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