10*log(4.3*10^7/10^-12)
$${\mathtt{10}}{\mathtt{\,\times\,}}{log}_{10}\left({\frac{{\mathtt{4.3}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{7}}}}{{{\mathtt{10}}}^{-{\mathtt{12}}}}}\right) = {\mathtt{196.334\: \!684\: \!555\: \!795\: \!85}}$$