Your right, a plumber might be spendy for that one.
Best to break your project down to smaller tasks. You need to remove whats in front of the pipe to gain access. Maybe even remove the water lines. Then cut out above and below the drainage tees- do you have access below such as a basement?
Then you can rebuild it using PVC or ABS pipe- join to existing material using Fernco's or, preferably no-hub couplings.
You might discover more pipe that needs repair. It looks like the arm to the sink has already been replaced- possibly for the same reason.
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