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18+4z=-15-6z+7z
We move all terms to the left:
18+4z-(-15-6z+7z)=0
We add all the numbers together, and all the variables
4z-(z-15)+18=0
We get rid of parentheses
4z-z+15+18=0
We add all the numbers together, and all the variables
3z+33=0
We move all terms containing z to the left, all other terms to the right
3z=-33
z=-33/3
z=-11
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