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