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0.1 = 1/(1.88E+05 * 6.974^2) * ln(x/J*(J-6.974)/(x-6.974) - 6.974*(1/x-1/J))
0.1 = 1/(1.88E+05 * 6.974^2) * ln(x/J*(J-6.974)/(x-6.974) - 6.974*(1/x-1/J))
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