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8z+9=15+6z
We move all terms to the left:
8z+9-(15+6z)=0
We add all the numbers together, and all the variables
8z-(6z+15)+9=0
We get rid of parentheses
8z-6z-15+9=0
We add all the numbers together, and all the variables
2z-6=0
We move all terms containing z to the left, all other terms to the right
2z=6
z=6/2
z=3
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