3 - 7 = -4
Why?
7 is a bigger number than 3 which makes the answer a negative number.
-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9
that is a number line and if you start from 3 and go back 7 spaces it would be -4.
In conclusion,
-4 is the absolute value of 3 - 7.