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19z-2z+9=17z+9
We move all terms to the left:
19z-2z+9-(17z+9)=0
We add all the numbers together, and all the variables
17z-(17z+9)+9=0
We get rid of parentheses
17z-17z-9+9=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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