add: 8x-3y+7z,_4x+5y-4z,-x-y-2z
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Answer:
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Step-by-step explanation:
8x-3y+7z +4x+5y-4z-x-y-2z
8x+4y-x-3y+5y-y+7z-4z-2z
12x-x+2y-y+3z-2z
11x+y+z
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