Use the order of operations to evaluate. 3(7) - 28 + 7

PREALGEBRA
15th Edition
ISBN:9781938168994
Author:OpenStax
Publisher:OpenStax
Chapter10: Polynomials
Section10.4: Divide Monomials
Problem 315E: Roxie thinks n0simplifies to 0. What would you say to convince Roxie she is wrong?
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I am somewhat confused with this. I thought the result was 0, since
3(7) - 28 + 7
21 - 28 + 7
-7 + 7
= 0
but it still tells me the answer is wrong.
 
Use the order of operations to evaluate.

3(7) - 28 + 7

 

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