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5z=7z+4
We move all terms to the left:
5z-(7z+4)=0
We get rid of parentheses
5z-7z-4=0
We add all the numbers together, and all the variables
-2z-4=0
We move all terms containing z to the left, all other terms to the right
-2z=4
z=4/-2
z=-2
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