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v in (-oo:+oo)
v = 3.14*(4/3)*7^3 // - 3.14*(4/3)*7^3
v-(3.14*(4/3)*7^3) = 0
v-4.18666667*7^3 = 0
v-1436.02666781 = 0 // + 1436.02666781
v = 1436.02666781
v = 1436.02666781
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