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3z+4z=6z+3
We move all terms to the left:
3z+4z-(6z+3)=0
We add all the numbers together, and all the variables
7z-(6z+3)=0
We get rid of parentheses
7z-6z-3=0
We add all the numbers together, and all the variables
z-3=0
We move all terms containing z to the left, all other terms to the right
z=3
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