Add x+y-z+3xyz , x+y+z , z-y-8xyz
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x+y-z+3xyz+x+y+z+z-y-8xyz
x+x+y+y-y-z+z+z+3xyz-8xyz
2x+y+z-5xyz
x+x+y+y-y-z+z+z+3xyz-8xyz
2x+y+z-5xyz
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