NO. You can't just throw a second wye in.
The point of plumbing, is to prevent trap siphoning.
Of course if you don't care about smell, then it doesn't matter.
Each trap needs to be vented.
When you run waste paste a second sink, it pulls the water from that trap.
When that happens, well I guess you know what it's like to live in Guatemala.
You are now becoming your own third world country.
Third World Plumbing
It seems that people in developed nations have subsequently either forgotten about or never really been aware of the public health role of the plumbing industry.
If it is accepted that the plumber is a health professional, then a comparison can be drawn with the education and training requirements of other health professionals. Few would claim that a doctor or nurse can acquire all of their necessary skills and knowledge in a few weeks. Nor is that the case for the plumbing health professional.