Your matrix notation does not distinguish rows from columns, which is critical in matrices.
The best possible interpretation I get is:
a11 a12 a13
a21 a22 a23
a31 a32 a33
c1 c2 c3
which is then multiplied by another
So multiply rows of a to the column b to give c, for example:
and similarly for the other rows.
Same for e:
Through the multiplication, you will preserve the value of x, and equate the value of e to zero to solve for x.
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