Question

2x+9y-7z, 3y+z-3x, 2z-4y-x

Answer 1

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2x + 9y - 7z, 3y + z - 3x, 2z - 4y - x

= 2x + 9y - 7z + 3y + z - 3x + 2z - 4y - x

= 2x - 3x - x + 9y + 3y - 4y - 7z + z + 2z

= 2x - 4x + 12y - 4y - 7y + 3z

= - 2x + 8y - 4z

= -2(x - 4y + 2z)

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