It is another way to say approximately. If you say, 345.5 is the sum, plus or minus, you mean that 345.5 is not the exact answer, but close enough for the situation.
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The sum of 6 and -4 is two.
The answer is -7. minus three plus one is minus two, adding a negative is the same as subtraction and so plus negative five means minus 5 so the sum is -2-5=-7 The Sum= -3+1-5 -2-5 -7
"minus zero" is the same as plus zero in that it makes no difference to the sum. So the answer is -3.
A plus + a plus is a plus.
2