<u><em>Explanation:</em></u> <u>1- We can note that 153 is common in the three terms. Therefore, we can take 153 as a common factor. This will give us:</u> 153(80-47-33)
<u>2- We resolve the operations within the parentheses. This will give us:</u> 153(33-33) <u>which is equivalent to:</u> 153(0)
<u>3- Finally, we know that any number multiplied by a zero gives a zero. Therefore:</u> 153*0 = zero