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v in (-oo:+oo)
v = 3.14*(4/3)*9.71^3 // - 3.14*(4/3)*9.71^3
v-(3.14*(4/3)*9.71^3) = 0
v-4.18666667*9.71^3 = 0
v-4.18666667*9.71^3 = 0 // + -4.18666667*9.71^3
v = -(-4.18666667*9.71^3)
v = 4.18666667*9.71^3
v = 4.18666667*9.71^3
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