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z=2(z-19)
We move all terms to the left:
z-(2(z-19))=0
We calculate terms in parentheses: -(2(z-19)), so:We get rid of parentheses
2(z-19)
We multiply parentheses
2z-38
Back to the equation:
-(2z-38)
z-2z+38=0
We add all the numbers together, and all the variables
-1z+38=0
We move all terms containing z to the left, all other terms to the right
-z=-38
z=-38/-1
z=+38
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