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