0-(first #)-(2nd #)
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Your standard Windows calculator (or equivalent in another operating system) will do negative numbers.
use a calculator
You add as normal , pretend as if the signs weren't there,but the answer will be a negative!
The answer is -5. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
if they are both negative, add like they are positive numbers, but just add the negative sign.