Any negative number plus another negative number will always remain negative.
Ex. -1 + -1 = -2
Ex. -14 + -1000 = -1014
They become even more negative.
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9 + -9 = 0 zero is neither postitive nor negative, see integer line below ...-5,-4-,3,-2,-1,0,+1,+2,+3,+4,+5...
81 (positive eighty-one)
A negative plus a negative is a negative because a negative plus a negative is the same thing as a negative minus a positive number.
Negative infinity plus negative infinity equals negative infinity.
Is a negative.