11x + 9y - 8z -12 -9x -7y +2z +12
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Step-by-step explanation:
11x-9x+9y-7y-8z+2z-12+12
-2x+2y-6z
Our answer of:
11x+9y-8z-12-9x-7y+2z+12
=-2x+2y-6z
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