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7z-204=12-18z-2z
We move all terms to the left:
7z-204-(12-18z-2z)=0
We add all the numbers together, and all the variables
7z-(-20z+12)-204=0
We get rid of parentheses
7z+20z-12-204=0
We add all the numbers together, and all the variables
27z-216=0
We move all terms containing z to the left, all other terms to the right
27z=216
z=216/27
z=8
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