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v in (-oo:+oo)
(v^1)/2 = 2 // - 2
(v^1)/2-2 = 0
v/2-2 = 0
1/2*v-2 = 0 // + 2
1/2*v = 2 // : 1/2
v = 2/1/2
v = 4
v = 4
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