Syntax for inserting a number in a shell script in applescript

who can help me correct this code?
the user will enter a number in a dialog box, and this variable will replace the 7 in the shell script.
i cant seem to keep the syntax right, i keep erroring out.
if days_back is "" then
set dialog_1 to display dialog "please enter a number " default answer ""
set the days_back to the text returned of dialog_1
end if
set the_result to (do shell script "mdfind -onlyin '/Volumes/Volume1' 'kMDItemFSContentChangeDate >=$time.today(-7)'")
display dialog the_result

Try using:
if days_back is "" then
set dialog_1 to display dialog "please enter a number " default answer ""
set the days_back to the text returned of dialog_1
end if
do shell script ("mdfind -onlyin '/Volumes/Volume1' 'kMDItemFSContentChangeDate >=$time.today(-" & days_back & ")'")
display dialog the result
(54186)

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