Have you not taken the time to search the web for examples?

If you search for "linear equations c++" you should find numerous.

e.g. -

**C++ Program to Solve any Linear Equation in One Variable**

https://www.tutorialspoint.com/cplusplus-program-to-solve-any-linear-equation-in-one-variable

**Linear Equation Solver in C++**

https://www.codeproject.com/articles/675908/linear-equation-solver-in-cplusplus

**Gaussian elimination in C++**

https://www.codespeedy.com/gaussian-elimination-in-cpp/

*"In this tutorial, we will learn how to solve linear equations
using Gaussian elimination in C++."*

- Wayne