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I think the question is not 8 plus minus five, i think its 8 plus negative 5, which would still be three. ie. 8+(-5)=3 or 8+-5=3. the proper way to write 8 plus negative five is my first example
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It is a bigger plus. For example, 5 - (-3) = 5 + 3 = 8
-8 - (-13) = - 8 + 13 = +5 ( minus a minus is a plus)
5
-5 - 4 + (-8) = -17
3-4 plus 5-32 minus 1-8 is equal to -37