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4z-7z=9-6z
We move all terms to the left:
4z-7z-(9-6z)=0
We add all the numbers together, and all the variables
4z-7z-(-6z+9)=0
We add all the numbers together, and all the variables
-3z-(-6z+9)=0
We get rid of parentheses
-3z+6z-9=0
We add all the numbers together, and all the variables
3z-9=0
We move all terms containing z to the left, all other terms to the right
3z=9
z=9/3
z=3
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