Welcome to the forums . We'd need more information to help you out, but assuming that the numbers are in column I (and any title text is in column H), then you'd need something like this in I30:
=SUM(I27+I28-I29)
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. We'd need more information to help you out, but assuming that the numbers are in column I (and any title text is in column H), then you'd need something like this in I30: