First thing to do, is follow the order of operations: Multiplications and divisions, then subtractions and addition.
7*38+3*45-56=n
You first start by calculating the Multiplications, which are in this equation 7*38=266 and 3*45=135.
So 7*38+3*45-56 = 266+135-56 = n
Then, you move to the additions and subtractions:
266 + 135 - 56 = 345.
So n=345.
Hope this Helps! :)
