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v in (-oo:+oo)
v = 3.14*(4/3)*4^3 // - 3.14*(4/3)*4^3
v-(3.14*(4/3)*4^3) = 0
v-4.18666667*4^3 = 0
v-267.94666688 = 0 // + 267.94666688
v = 267.94666688
v = 267.94666688
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