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9-3z=-9-9z
We move all terms to the left:
9-3z-(-9-9z)=0
We add all the numbers together, and all the variables
-3z-(-9z-9)+9=0
We get rid of parentheses
-3z+9z+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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