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x=sqrt((27*A^2*D^2+(4*B^3-18*A*B*C)*D+4*A*C^3-B^2*C^2)*T^2+(-54*A*D^2+18*B*C*D-4*C^3)*T+27*D^2)/(6*sqrt(3)*D^2*T)-(27*A*D^2*T-9*B*C*D*T+2*C^3*T-27*D^2)/(54*D^3*T)
y=x^(1/3)
z=y-(3*B*D-C^2)/(9*D^2*y)-C/(3*D)
R=RT*e^z