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how to solve a math problem

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you have to apply the order of operation PEMDAS which means operations in parentheses get done first above all else. This problem does not have operations in parentheses so you move on to E (exponents) which there are none.  Then you do any multiplications and divisions in order from left to right.  Since there are no divisions you would multiply the -11 and the 8 since they are written next to each other with no other operation symbol between them.  Once you get the product you then would do all additions (A) and subtractions(S) in order form left to right.  Hope that helps