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9-z+3-2z=12-3z
We move all terms to the left:
9-z+3-2z-(12-3z)=0
We add all the numbers together, and all the variables
-z-2z-(-3z+12)+9+3=0
We add all the numbers together, and all the variables
-3z-(-3z+12)+12=0
We get rid of parentheses
-3z+3z-12+12=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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