Keep Change Flip
for example, lets use (-7) - (-8)
Keep the first symbol (-7) - (-8)
Change the next symbol (-7) + (-8)
Flip the last symbol (-7) + (+8)
Since 8 is larger than 7, subtract 7 from 8 ( it equals 1)
Keep the symbol of the the larger number (+)
the answer is +1
Now, the answer will be greater than.