More often, I think, you are going to say that you are concerned about the problem. You're worrying about it. On the other hand, you may be involved in the problem, working on solving it, perhaps.
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CalifJimThese computations are concerned with subatomic particles.It appears none of your samples has anything to do with "worrying" emotionally, is it? "Concerned with" here sounds more like "rel
I'm not sure what a modem is, but it's something that's concerned with computers.
AARP is an organization that is concerned with retired people.