(4) Subtract 3x - y + 4z from x + 2y-Z.
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Answer:
3x(x+y+z)-2y(x-y+z)-[4z(-x+y+z)]
3x^2+3xy+3xz-2xy+2y^2-2yz+4zx-4yz-4z^2
3x^2+2y^2-4z^2+xy+7xz-6yz
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Answer -2x+3y-3z
x+2y-z-(3x-y+4z)
=x+2y-z-3x+y-4z=-2x+3y-3z
x+2y-z-(3x-y+4z)
=x+2y-z-3x+y-4z=-2x+3y-3z
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