When you see "minus a negative number" you write it as "plus a positive number". So when you see -(-4) you rewrite it as +(+4) or just + 4 -3 - 5 - (-4) then you rewrite that as: -3 - 5 + 4 Combine -3 and -5 as -8. Then you rewrite that as -8 + 4 Then you combine those and get -4 Edwin