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v in (-oo:+oo)
v = 12*(1/3)^3.14*3^2 // - 12*(1/3)^3.14*3^2
v-(12*(1/3)^3.14*3^2) = 0
v-12*3^2*(1/3)^3.14 = 0
v-108*(1/3)^3.14 = 0 // + -108*(1/3)^3.14
v = -(-108*(1/3)^3.14)
v = 108*(1/3)^3.14
v = 108*(1/3)^3.14
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