Use the rules of negative numbers to calculate - 6 + - 6 - - 2

-6 + - 6 - - 2

Adding a negative is the same as subtracting a positive.

-6 - 6 - - 2

Subtracting a negative is the same as adding a positive.

-6 - 6 + 2

Subtracting a number from a negative number is like adding the positive numbers, just remember to put the negative sign in front of the number.

-12 + 2

Adding a positive number to a negative number is like subtracting a positive from another positive, but don't forget the negative sign when you're done.

-12 + 2 = - 10

So you can use parenthases to group

(-6) + (-6) - (-2)

you can add the 2 negatives

(-12) - (-2)

if you subtract a negative it's like taking away a minus or adding

(-12) + (2)

(-10)