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9(z-3)=-9
We move all terms to the left:
9(z-3)-(-9)=0
We add all the numbers together, and all the variables
9(z-3)+9=0
We multiply parentheses
9z-27+9=0
We add all the numbers together, and all the variables
9z-18=0
We move all terms containing z to the left, all other terms to the right
9z=18
z=18/9
z=2
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