Simplify the following expression.
12 + 11 - 13 + (4 + 3)
=Â 12 + 11 - 13 + (4 + 3)
= 12 + 11 - 13 + 7
= 12 + 11 + 7Â - 13Â
= 30Â - 13
= 17
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