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(9.074*10^-5) = root { ( 2*11.8*8.85*10^-14*2*0.026*ln(x/10^10) ) / (1.6*10^-19*x) }
(9.074*10^-5) = root { ( 2*11.8*8.85*10^-14*2*0.026*ln(x/10^10) ) / (1.6*10^-19*x) }
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