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7z-7=10+4z
We move all terms to the left:
7z-7-(10+4z)=0
We add all the numbers together, and all the variables
7z-(4z+10)-7=0
We get rid of parentheses
7z-4z-10-7=0
We add all the numbers together, and all the variables
3z-17=0
We move all terms containing z to the left, all other terms to the right
3z=17
z=17/3
z=5+2/3
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