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2z+4=4+2z
We move all terms to the left:
2z+4-(4+2z)=0
We add all the numbers together, and all the variables
2z-(2z+4)+4=0
We get rid of parentheses
2z-2z-4+4=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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