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A in (-oo:+oo)
A = 3.4*5.9*(1/2) // - 3.4*5.9*(1/2)
A-(3.4*5.9*(1/2)) = 0
A-10.03 = 0
A-10.03 = 0 // + 10.03
A = 10.03
A = 10.03
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