400-(34×17)+12×8=

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

400 - 578 + 96 = -82

Gruß radix !