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7z=8z-4
We move all terms to the left:
7z-(8z-4)=0
We get rid of parentheses
7z-8z+4=0
We add all the numbers together, and all the variables
-1z+4=0
We move all terms containing z to the left, all other terms to the right
-z=-4
z=-4/-1
z=+4
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