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v in (-oo:+oo)
v = 3.14*20*196*(1/3) // - 3.14*20*196*(1/3)
v-(3.14*20*196*(1/3)) = 0
v-4102.93333333 = 0
v-4102.93333333 = 0 // + 4102.93333333
v = 4102.93333333
v = 4102.93333333
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