Question: How to simplify terms into sums?


I am using Maple to do a parameter estimation on systems of ODEs using linear least-squares.

Though I have solved the problem, I would like to arrive into better symbolic expressions for the parameters, as they are obtained as the solution of systems of linear equations where the coefficient matrix and the RHS vector have sums as their elements.

The difficulty I have now is that the expressions I arrive at are, for instance:

and what I would like to do, now, would be to express this as


x and y are already defined as vectors.

Is there any way I can do it?



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