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solve 2*10^(-4.2)=-5.5*10^(-5)+((5.5*10^(-5))^2+4*5.5*10^(-5)*x)^(1/2)
solve 2*10^(-4.2)=-5.5*10^(-5)+((5.5*10^(-5))^2+4*5.5*10^(-5)*x)^(1/2)
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