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z=4z+38=90
We move all terms to the left:
z-(4z+38)=0
We get rid of parentheses
z-4z-38=0
We add all the numbers together, and all the variables
-3z-38=0
We move all terms containing z to the left, all other terms to the right
-3z=38
z=38/-3
z=-12+2/3
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