two negatives makes a positive, meaning you add.
i.e. 2 - -2 = 2+2 = 4
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Either.
yes.
By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract
In fractions, you can NEVER add or subtract
Depends on the actual numbers.-a-(-b) = -a+bIf a>b the answer's negativeIf aIf a=b the answer's 0