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2z-18=2z-15-3
We move all terms to the left:
2z-18-(2z-15-3)=0
We add all the numbers together, and all the variables
2z-(2z-18)-18=0
We get rid of parentheses
2z-2z+18-18=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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