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10z+9+4z=8z-9
We move all terms to the left:
10z+9+4z-(8z-9)=0
We add all the numbers together, and all the variables
14z-(8z-9)+9=0
We get rid of parentheses
14z-8z+9+9=0
We add all the numbers together, and all the variables
6z+18=0
We move all terms containing z to the left, all other terms to the right
6z=-18
z=-18/6
z=-3
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