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-9(z+6)-18=9
We move all terms to the left:
-9(z+6)-18-(9)=0
We add all the numbers together, and all the variables
-9(z+6)-27=0
We multiply parentheses
-9z-54-27=0
We add all the numbers together, and all the variables
-9z-81=0
We move all terms containing z to the left, all other terms to the right
-9z=81
z=81/-9
z=-9
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