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