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-2x+3y+z+x-y+3z
x+2y+4z
2. (x2 +y2 -z)-(-2y2+3x2+5z)
x2+y2-z+2y2-3x2-5z
-2x2+3y2-6z
3. (-6m2-6n-p +m2-n-p
5m2-7n-2p
4. 15+8b+7c-a -8+a-7b-c
7+b+6c
5. -6x2+1-x -x2 +5x-8
-7x2-7+4x