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10z=13+9z
We move all terms to the left:
10z-(13+9z)=0
We add all the numbers together, and all the variables
10z-(9z+13)=0
We get rid of parentheses
10z-9z-13=0
We add all the numbers together, and all the variables
z-13=0
We move all terms containing z to the left, all other terms to the right
z=13
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