If you add -6 to 7 and then subtract -8 from the result, what will be the answer?
9
Stand on 7 on the number line, then move 6 places to the left in order to add -6 to 7, you will reach 1.
Now, move 8 places to the right to subtract -8 from 1, you will reach 9, i.e., 1−(−8)=1+8=9