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Ok, let's take a look at this;
It sounds like either your trap is clogged; you will need to remove it and clean out the obstruction. Make sure to have a bucket near by to catch the water from the sinks.
If the trap is clear, then you will need to get yourself a sewer auger from a rental place, or have a company come auger it for you.
As far as the wrench, it is made for when the garbage disposal is jammed.
Here is a movie, to install a disposal; at the end of the move it shows how to use the wrench.
Another thought would be to use a drain king. This will cause a seal in the pipe to allow the pressure to build up. These are only around 10 to 15 dollars. Best tool to have for the price...lol
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