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v in (-oo:+oo)
-2*v = 1/3 // - 1/3
-2*v-(1/3) = 0
-2*v-1/3 = 0
-2*v-1/3 = 0 // + 1/3
-2*v = 1/3 // : -2
v = 1/3/(-2)
v = -1/6
v = -1/6
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