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If she claims you as a dependent you get nothing. Just because you are 18 doesn't mean she can't still claim you....my parents claimed me until I got married because they were supporting me through college.
If she doesn't and you worked and made the minimum amount you should get $600. If your brother is a minor and your mom claims him she would get $900. If she also claims you, she would get another $300, so $1200 total.
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