Answer
$c-1$
Work Step by Step
d is directly to the left of c, so c is 1 more than d.
$d+1=c$
subtract 1 from each side
$d+1-1=c-1$
$d=c-1$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.