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z+18+z+13=z+50
We move all terms to the left:
z+18+z+13-(z+50)=0
We add all the numbers together, and all the variables
2z-(z+50)+31=0
We get rid of parentheses
2z-z-50+31=0
We add all the numbers together, and all the variables
z-19=0
We move all terms containing z to the left, all other terms to the right
z=19
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