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considere el siguiente sistema de ecuaciones: x 1 + 3 x 2 + 2 x 3 + x 4 = - 2 4 x 1

considere el siguiente sistema de ecuaciones:
x1+3x2+2x3+x4=-2
4x1+2x2+x3+2x4=2
2x1+x2+2x3+3x4=1
x1+2x2+4x3+x4=-1
a) Escriba el sistema como una matriz de la forma Ax=b.
b) Resuelva el sistema convirtiendolo en una matriz triangular superior y luego use el mtodo de sustitucin hacia atrs.
c)Encuentre el determinante de la matriz A, obtenga la inversa de esa matriz y finalmente multiplique A**A-1 I would like a program or two in Fortran to solve this problem for me
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