In a corporate accounting department, a trainee is learning to simplify adjustments using the 'adding the opposite' rule. Match each subtraction expression with its equivalent addition expression.

An inventory specialist is reviewing data adjustments and encounters the expression $-5 - (-1)$. According to the 'adding the opposite' rule, which of the following addition expressions is equivalent to the original subtraction?

A logistics coordinator is reconciling an inventory list. They have a current adjustment of 6 units and need to subtract a previously recorded loss of -13 units. They write the expression ${}6 - (-13)$. According to the 'adding the opposite' rule, this expression is equivalent to ${}6 + 13$.

A retail manager is adjusting a sales report and needs to simplify the expression ${}6 - (-13)$ to account for a returned credit. Using the 'adding the opposite' rule, arrange the steps below in the correct order to convert the subtraction into an addition problem and determine the final value.

An inventory clerk needs to adjust a stock count by subtracting a recorded shortage of $-13$ from a current count of ${}6$, written as the mathematical expression ${}6 - (-13)$. Recalling the 'adding the opposite' rule, the clerk changes the subtraction of a negative into the addition of a positive, rewriting the expression as ${}6$ + ____.