I have derived a set of equations of motion and now want to rearrange and simply them, but I am not sure which command I should use.

For example, I have: (1) dF_1 + eF_2 == Ma; (2) F_1 == m + n; (3) F_2 == f + g; (4) m == K + L;

Now I want to eliminate F_1, F_2, and m, since they are redundant. I tried "Eliminate" but it gave me weird results when I had more than one set of such equations. What is the best command I should use to rearrange and simplify these equations? Thanks!!!