Simultaneously Solving 12 unknowns with 12 equations

Gday, I have used various methods to attempt to simultaneously solve the provided equations but have had no success. What is the most effective method for solving this particular set of equations?

Answer 1

[Roger Stafford]

At a glance, these are all linear equations in the twelve unknowns. If so, form the 12 x 12 matrix of coefficients and use matlab's backslash operator. This is one of the things matlab does best.