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9(-1+z)-7z=13
We move all terms to the left:
9(-1+z)-7z-(13)=0
We add all the numbers together, and all the variables
9(z-1)-7z-13=0
We add all the numbers together, and all the variables
-7z+9(z-1)-13=0
We multiply parentheses
-7z+9z-9-13=0
We add all the numbers together, and all the variables
2z-22=0
We move all terms containing z to the left, all other terms to the right
2z=22
z=22/2
z=11
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