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