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81-3z=-108+6z
We move all terms to the left:
81-3z-(-108+6z)=0
We add all the numbers together, and all the variables
-3z-(6z-108)+81=0
We get rid of parentheses
-3z-6z+108+81=0
We add all the numbers together, and all the variables
-9z+189=0
We move all terms containing z to the left, all other terms to the right
-9z=-189
z=-189/-9
z=+21
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