If it's not what You are looking for type in the equation solver your own equation and let us solve it.
v in (-oo:+oo)
v = 3.14*12*16*(1/3) // - 3.14*12*16*(1/3)
v-(3.14*12*16*(1/3)) = 0
v-200.96 = 0
v-200.96 = 0 // + 200.96
v = 200.96
v = 200.96
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