Answer
$8$
Work Step by Step
Recall the following rule: $a-(-b)=a+b$. Thus, we obtain:
$-7+15$
We can find the sum of a positive and a negative integer by subtracting the smaller absolute value from the larger absolute value and giving the result the sign of the original number that has the larger absolute value.
Since $|15|>|-7|$, we can subtract $7$ from $15$, giving us $8$. Since the larger absolute value was originally positive, we give our result the positive sign: $8$
