Solve2 is equivalent to Solve, except that it works only for linear equations (and returns just a list) and accepts the options Factoring and FinalSubstitutions. Solve2 uses the "high school algorithm" and factors intermediate results.Therefore it can be drastically more useful than Solve.
If no equation sign is given the polynomials are supposed to be 0.
The FeynCalc Book | SOD | SP |