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2z-(7-5z)-21=0
We add all the numbers together, and all the variables
2z-(-5z+7)-21=0
We get rid of parentheses
2z+5z-7-21=0
We add all the numbers together, and all the variables
7z-28=0
We move all terms containing z to the left, all other terms to the right
7z=28
z=28/7
z=4
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