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solve 1.908=(1/(1.4M^2))-((M^2)/(1.4M^2))+0.508*ln((1.2M^2)/(1+0.2M^2))
solve 1.908=(1/(1.4M^2))-((M^2)/(1.4M^2))+0.508*ln((1.2M^2)/(1+0.2M^2))
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