Add the following 3x+4y-15z,6x+7y,12y-7z-9x
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Step-by-step explanation:
3x+4y-15z + 6x+7y + 12y-7z-9x
= 3x+6x-9x + 4y+7y+12y - 15z-7z
= 0 + 23y - 22z
= 23y - 22z Answer
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