Answer:
first part: 5
second part: 3
Explanation:
for the first part, you want to plug in -8 to your x values in the equation, so it would be -(-8)-3. Simplified, that would be just 8-3, which is obviously known to be 5.
For the second part, you want the equation to equal -6 and then solve, so you would start by writing -6=-x-3. Since we want to get x alone in the equation, you would add 3 to both sides, making it -3=-x. Since we don't want a negative x, the final answer would be 3=x.