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3z=7z-1
We move all terms to the left:
3z-(7z-1)=0
We get rid of parentheses
3z-7z+1=0
We add all the numbers together, and all the variables
-4z+1=0
We move all terms containing z to the left, all other terms to the right
-4z=-1
z=-1/-4
z=1/4
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