It is two times the magnitude of the integer.
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To add two integers with opposite signs . . . -- Ignore the signs, and write the difference between the two numbers. -- Give it the same sign as the larger original number has.
The two integers are A and A+40 or, equivalently, B and B-40.
For each pair of such integers, find the difference between the absolute values of the two integers and allocate the sign of the bigger number to it.
7 and -4
It isn't. 5 - 10 = -5