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v in (-oo:+oo)
v = 3.14*6.52*(4/3) // - 3.14*6.52*(4/3)
v-(3.14*6.52*(4/3)) = 0
v-27.29706667 = 0
v-27.29706667 = 0 // + 27.29706667
v = 27.29706667
v = 27.29706667
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