-1 or negative one
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minus 1 (-1) and plus 1 (+1) are two integers. That is why, when -1 and plus one are operated or, are solved the answer is zero. as, on a number line the positive integers are greater than the negative ones. so, the sum would look like, +1-1 / -1+1. Using the addition property of an integer, +,- is equal to -. IE, plus, minus = minus. so it is -1-1=0and when +1-1 yet, 1-1=0 so answer is 0.
1.
0-(-1) is the same as 0+1, so 0-(-1)=1
-1 minus 6 is -7
-1 (Negative 1).