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-3(z+11)=9
We move all terms to the left:
-3(z+11)-(9)=0
We multiply parentheses
-3z-33-9=0
We add all the numbers together, and all the variables
-3z-42=0
We move all terms containing z to the left, all other terms to the right
-3z=42
z=42/-3
z=-14
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