+79 This IS a calculator site.
Anyway:
$${\frac{\left({\mathtt{64}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{3}}}}\right)}{\left({\frac{{\mathtt{1}}}{{\mathtt{8}}}}\right)}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}$$
$${\frac{\left({\mathtt{64}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{3}}}}\right)}{{\mathtt{0.125}}}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}$$
64+2/3 
64.66667
$${\frac{{\mathtt{64.666\: \!666\: \!666\: \!666\: \!666\: \!7}}}{{\mathtt{0.125}}}}$$517.3333333333333336
517.3333333333333336-1/3 517.0000000000000002667 517
+79 This IS a calculator site.
Anyway:
$${\frac{\left({\mathtt{64}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{3}}}}\right)}{\left({\frac{{\mathtt{1}}}{{\mathtt{8}}}}\right)}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}$$
$${\frac{\left({\mathtt{64}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{3}}}}\right)}{{\mathtt{0.125}}}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}$$
64+2/3 64.66667
$${\frac{{\mathtt{64.666\: \!666\: \!666\: \!666\: \!666\: \!7}}}{{\mathtt{0.125}}}}$$517.3333333333333336
517.3333333333333336-1/3 517.0000000000000002667 517
