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9+7z=6+8z
We move all terms to the left:
9+7z-(6+8z)=0
We add all the numbers together, and all the variables
7z-(8z+6)+9=0
We get rid of parentheses
7z-8z-6+9=0
We add all the numbers together, and all the variables
-1z+3=0
We move all terms containing z to the left, all other terms to the right
-z=-3
z=-3/-1
z=+3
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