-8-(-2)

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You are subtracting a negative integer from a negative integer.-8 stays as it is, however - (-2)  means that the term inside the grouping (-2) is to be turned into a positive 2 because the minus sign in front of the grouping ( ) means that everything inside the grouping turns into its opposite sign.the problem is now -8 +2 = -6

you can also think of -(-2) as -1(-2)

well since there are 2 negative signs next to eachother, the negative 2 turns into a positive 2. so it would be -8 + 2 which equals -6

-6