Question: HELP SIMPLIFYING (JUST LAST 3 LINES MAINLY)

Trying to simplify an expression and keep getting the error message "unkown operator". Same error message creeping up a lot now in my efforts to get acquainted with Maple. Getting really annoying and frustrating. Also I'm having trouble looking up specific error messages with the help feature. Is this also possible ? > > Error, invalid exponent > > > > > > > > > > > > Error, unknown operator > Error, unable to match delimiters > > > > > > > > > > > > Error, (in LinearAlgebra:-LinearSolve) invalid input: LinearAlgebra:-LinearSolve expects its 1st argument, A, to be of type {Matrix, list({Matrix, Vector})} but received 19 > > > Error, unknown operator > Error, unknown operator > Error, unknown operator > Error, unknown operator > > Error, unable to match delimiters > Error, unknown operator > This post generated using the online HTML conversion tool Download the original worksheet
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