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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