def solveswc(ecu_list, res_list):
"""
Solves simplifying big linear systems.
"""
A, B = syst2matrix(ecu_list, res_list)
Den = Matrix(A)
den = simplify(factordet(Den))
Num, num = [], []
for i in range(A.cols):
Num.append(Matrix(A))
Num[i][i] = B
num.append(factordet(Num[i]))
Den = Den.det_bareis()
return {res_list[i]: cancel(num[i]/den)*Num[i].det_bareis()/Den for i in range(len(res_list))}
