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When you are subtracting a negative from a positive or a positive from a negative, you change subtraction to addition and change the sign of the next value.

example: (-23)-(-12).......change it to........(-23)+12

Then you subtract the bigger number from the smaller number. Don't worry about the negative signs just pretend that the numbers are both positve.

Example: 23-12=11

Then you take the sign of the biggest number.

example: 23 was the bigger number and it was negative so the answer is -11

Hope this helped!

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