I don't get this
-2-1 Divided by 12-6
$${\mathtt{\,-\,}}{\mathtt{2}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}}{{\mathtt{12}}}}{\mathtt{\,-\,}}{\mathtt{6}} = {\mathtt{\,-\,}}{\frac{{\mathtt{97}}}{{\mathtt{12}}}} = -{\mathtt{8.083\: \!333\: \!333\: \!333\: \!333\: \!3}}$$