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v in (-oo:+oo)
v = 3.14*(4/3)*30^3 // - 3.14*(4/3)*30^3
v-(3.14*(4/3)*30^3) = 0
v-4.18666667*30^3 = 0
v-113040.00009 = 0 // + 113040.00009
v = 113040.00009
v = 113040.00009
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