Question
Replace each * by the correct digit in the following:
$\ \ \ \ \ \ 9\ 1\ 7\\ \underline{-\ *\ 5\ *\ }\\\ \ \ \ \ 5\ *\ 8$
$\ \ \ \ \ \ 9\ 1\ 7\\ \underline{-\ *\ 5\ *\ }\\\ \ \ \ \ 5\ *\ 8$
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