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(57-7z)=2(z-3)
We move all terms to the left:
(57-7z)-(2(z-3))=0
We add all the numbers together, and all the variables
(-7z+57)-(2(z-3))=0
We get rid of parentheses
-7z-(2(z-3))+57=0
We calculate terms in parentheses: -(2(z-3)), so:We get rid of parentheses
2(z-3)
We multiply parentheses
2z-6
Back to the equation:
-(2z-6)
-7z-2z+6+57=0
We add all the numbers together, and all the variables
-9z+63=0
We move all terms containing z to the left, all other terms to the right
-9z=-63
z=-63/-9
z=+7
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