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4z-15=z-3+z+4
We move all terms to the left:
4z-15-(z-3+z+4)=0
We add all the numbers together, and all the variables
4z-(2z+1)-15=0
We get rid of parentheses
4z-2z-1-15=0
We add all the numbers together, and all the variables
2z-16=0
We move all terms containing z to the left, all other terms to the right
2z=16
z=16/2
z=8
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