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v in (-oo:+oo)
v = 3.14*(4/3)*700^3 // - 3.14*(4/3)*700^3
v-(3.14*(4/3)*700^3) = 0
v-4.18666667*700^3 = 0
v-1436026667.81 = 0 // + 1436026667.81
v = 1436026667.81
v = 1436026667.81
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