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8z=25+13z
We move all terms to the left:
8z-(25+13z)=0
We add all the numbers together, and all the variables
8z-(13z+25)=0
We get rid of parentheses
8z-13z-25=0
We add all the numbers together, and all the variables
-5z-25=0
We move all terms containing z to the left, all other terms to the right
-5z=25
z=25/-5
z=-5
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