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A in (-oo:+oo)
A = (3.14*12*5^2)/3 // - (3.14*12*5^2)/3
A-((3.14*12*5^2)/3) = 0
A-12.56*5^2 = 0
A-314 = 0 // + 314
A = 314
A = 314
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