$algebra negative plus negative equals a positive$

ALGEBRA NEGATIVE PLUS NEGATIVE EQUALS A POSITIVE INSTALL
ALGEBRA NEGATIVE PLUS NEGATIVE EQUALS A POSITIVE FREE

Remember 'a' or '-a' is arbitrary, by this I mean that this property holds for any real number. What it says? It says that if you take a number and add the negative of that number you get 0. The axiom says if there's a number 'a' then there must be an identity number 0 such that 'a+0=a' It follows from the axiom of existence of additive identity. This comes straight from Field axioms of real numbers, more precisely existence of additive inverse for each number.

ALGEBRA NEGATIVE PLUS NEGATIVE EQUALS A POSITIVE FREE

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ALGEBRA NEGATIVE PLUS NEGATIVE EQUALS A POSITIVE INSTALL

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Algebra negative plus negative equals a positive