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7z+5-5z=3+z-9
We move all terms to the left:
7z+5-5z-(3+z-9)=0
We add all the numbers together, and all the variables
7z-5z-(z-6)+5=0
We add all the numbers together, and all the variables
2z-(z-6)+5=0
We get rid of parentheses
2z-z+6+5=0
We add all the numbers together, and all the variables
z+11=0
We move all terms containing z to the left, all other terms to the right
z=-11
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