Note that you can solve this by using the method PEMDAS.
Solve the parentheses first:
21 + 3 + ( 8 ) ——— if you look closely in the parentheses (8 - 2 + 2) you should see that (- 2 + 2) is the same thing as (2 - 2) so you would be left with 8 inside your parentheses.
Combine like terms (add all the values):
21 + 3 + 8
= 24 + 8
= 32
21 + 3 + ( 8 - 2 + 2 ) = 32
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