400-(34×17)+12×8=
$${\mathtt{400}}{\mathtt{\,-\,}}\left({\mathtt{34}}{\mathtt{\,\times\,}}{\mathtt{17}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{8}} = -{\mathtt{82}}$$
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