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v in (-oo:+oo)
(9/2)*v-(1/4) = -1 // + 1
(9/2)*v-(1/4)+1 = 0
(9/2)*v-1/4+1 = 0
9/2*v+3/4 = 0 // - 3/4
9/2*v = -3/4 // : 9/2
v = -3/4/9/2
v = -1/6
v = -1/6
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