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v in (-oo:+oo)
v = 3.14*(4/3)*17.9^3 // - 3.14*(4/3)*17.9^3
v-(3.14*(4/3)*17.9^3) = 0
v-4.18666667*17.9^3 = 0
v-4.18666667*17.9^3 = 0 // + -4.18666667*17.9^3
v = -(-4.18666667*17.9^3)
v = 4.18666667*17.9^3
v = 4.18666667*17.9^3
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