yes, there is (someone who can help).
if you were careful about writing the problem according to the widely accepted conventions for the order of operations (do you recall PE-MD-AS), then the solution for "S" is
-log10((10*E*t)/(CL*K)).
if you were not so careful as to write the problem using those conventions, then please resubmit your problem with parentheses to indicate the correct grouping of terms.
