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Odd that 2 separate faucets would be affected. Both hot and cold? do they each have separate shut offs?
Ok, The first thing I would do is either disconnect the supply tubes under the sinks and see if the flow is any better there or pull the stems out of the faucets and turn the water back on to check the flow. I'd shut the water off at the main not under the sink since loose washers in the shut offs could be restricting the flow and you don't want to deal with that just yet
Each fixture is on a separate branch off the main. It's possible/likely the sinks are connected to the same branch. What I mentioned above would help pin down if this is a piping or a valve/faucet problem. If the flow is still poor then the next step is to pull the stems out of the shut offs under the sinks and check the flow there. Worst case is a problem with the supply branch to the sinks.
Depends on what the problem is. If your house is on a slab and the branch to the sinks is in the slab and the problem is with the supply piping then it could get expensive. Anything else, not real expensive unless you can't get parts for and/or you have to replace the faucets.
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