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b + 8 x a
Put a 9 where the "a" is and a 4 where the "b" is:
4 + 8 x 9
The PEMDAS rule tells us that we must multiply 8 x 9 before adding to 4.
So since 8 x 9 is 72, we put 72 where the 8 x 9 is:
4 + 72
Finally we add, and the final answer is:
76
Edwin
