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5z+3=9+4z
We move all terms to the left:
5z+3-(9+4z)=0
We add all the numbers together, and all the variables
5z-(4z+9)+3=0
We get rid of parentheses
5z-4z-9+3=0
We add all the numbers together, and all the variables
z-6=0
We move all terms containing z to the left, all other terms to the right
z=6
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