Please can someone type a code that can solve simultaneous equations with three unknowns with Gauss-Seidel method?

Answer 1

Nope.

Answer 2

Just try yourself, you know this is not a place where you can commission codes, that is not the purpose of SoloLearn.
Just try to type down some code, we know you can if you know a programming language, when (and if) you'll run into a problem, you can share your code and the community will be glad to help you