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2z+z-4=2z-4-2
We move all terms to the left:
2z+z-4-(2z-4-2)=0
We add all the numbers together, and all the variables
2z+z-(2z-6)-4=0
We add all the numbers together, and all the variables
3z-(2z-6)-4=0
We get rid of parentheses
3z-2z+6-4=0
We add all the numbers together, and all the variables
z+2=0
We move all terms containing z to the left, all other terms to the right
z=-2
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