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v in (-oo:+oo)
2*(-1/2)*v = (-1/2)*(-1/18) // - (-1/2)*(-1/18)
2*(-1/2)*v-((-1/2)*(-1/18)) = 0
2*(-1/2)*v-1/36 = 0
-v-1/36 = 0 // + 1/36
-v = 1/36 // * -1
v = -1/36
v = -1/36
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