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v in (-oo:+oo)
-1 = 2/3-2*v // - 2/3-2*v
-(-2*v)-(2/3)-1 = 0
2*v-2/3-1 = 0
2*v-5/3 = 0 // + 5/3
2*v = 5/3 // : 2
v = 5/3/2
v = 5/6
v = 5/6
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