When describing numbers, plus means the number is positive, or above 0. A negative number is one which is below 0. -1 is negative and +1 is positive.
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A negative plus a negative equals a negative.
Taking "and" to mean "plus", the answer is negative 12.
No, a negative plus a negative is a negative
A negative plus a negative still gives a negative answer.
The total sum is -12 or negative twelve.