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V in (-oo:+oo)
V = 7*(1/10)*3.14^3 // - 7*(1/10)*3.14^3
V-(7*(1/10)*3.14^3) = 0
V+(-7/10)*3.14^3 = 0
V-7/10*3.14^3 = 0 // + -7/10*3.14^3
V = -(-7/10*3.14^3)
V = 7/10*3.14^3
V = 7/10*3.14^3
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