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7z-6z=7z-2-z
We move all terms to the left:
7z-6z-(7z-2-z)=0
We add all the numbers together, and all the variables
7z-6z-(6z-2)=0
We add all the numbers together, and all the variables
z-(6z-2)=0
We get rid of parentheses
z-6z+2=0
We add all the numbers together, and all the variables
-5z+2=0
We move all terms containing z to the left, all other terms to the right
-5z=-2
z=-2/-5
z=2/5
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