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v in (-oo:+oo)
v = 9*(1/3)*4^2*pi // - 9*(1/3)*4^2*pi
v-(9*(1/3)*4^2*pi) = 0
v-3*4^2*pi = 0
v-48*pi = 0 // + -48*pi
v = -(-48*pi)
v = 48*pi
v = 48*pi
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