Question: Matrix form of equations

I have 8 equations (eq1, eq2, eq3, eq4, eq5, eq6, eq7 and eq8) with 8 varibles A1[n], A2[n], C1[n], C2[n], B2[n], A[k,i], D2[n], A[0,i] and where n=1..nn, k=1..nk, i=1..Q

I have some difficulties to get the matrix form AX=b

Thanks in advance for any help

I attached my maple code


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