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Matrices
Write the augmented matrix for the linear system.

 1 -1x - 2y - 4z = 15-6x + 3y + 8z = -182x - 6y + 5z = -123
 2 7x - 4y = -91-8x - 3y = 51
 3 -3x + 5y - 2z = -7-7x + 9y - 6z = 5-4x - 8y + 1z = 20
 4 -5x + 9y = 37-3x - 6y = -12
 5 2x - 1y = 24x + 7y = -32
 6 8x - 2y - 5z = 33-4x + 7y - 9z = 152-3x - 1y - 6z = 62
 7 -4x + 5y = -47-9x - 2y = -119
 8 -8x + 1y - 6z = -1186x - 1y + 7z = 110-3x - 4y + 9z = 72
 9 8x - 2y - 5z = -110-3x + 9y - 5z = -99-6x - 7y - 1z = 85
 10 -8x + 2y = 58-5x + 6y = 98
 11 -4x - 9y = -491x - 8y = -80
 12 -3x - 2y - 7z = -41-3x - 7y + 2z = 151x - 5y + 8z = 59
 13 4x - 9y - 6z = -74-1x + 4y + 2z = 197x - 8y - 3z = -85
 14 -5x + 6y = 4-4x + 5y = 2
 15 -2x - 3y = 2-1x - 7y = 34
 16 8x - 6y - 9z = -186-6x + 9y + 2z = 1615x - 8y - 7z = -160
 17 -3x + 4y = 1-3x - 2y = 31
 18 6x + 9y = -66-8x - 1y = 22

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