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-z+13-6z=7z-6z
We move all terms to the left:
-z+13-6z-(7z-6z)=0
We add all the numbers together, and all the variables
-z-6z-(+z)+13=0
We add all the numbers together, and all the variables
-7z-(+z)+13=0
We get rid of parentheses
-7z-z+13=0
We add all the numbers together, and all the variables
-8z+13=0
We move all terms containing z to the left, all other terms to the right
-8z=-13
z=-13/-8
z=1+5/8
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