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Write the system of equations as an augmented matrix.
`{(a,-,6c,-,2y,=,-104),(6a,+,5c,+,2y,=,172),(4a,+,4c,-,7y,=,42):}`
Box 1: Enter each element of the matrix as number (like 5, -3, 2.2)
`[(1,-6,-2,-104),(6,5,2,172),(4,4,-7,42)]`