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8(z+3)-5z=9
We move all terms to the left:
8(z+3)-5z-(9)=0
We add all the numbers together, and all the variables
-5z+8(z+3)-9=0
We multiply parentheses
-5z+8z+24-9=0
We add all the numbers together, and all the variables
3z+15=0
We move all terms containing z to the left, all other terms to the right
3z=-15
z=-15/3
z=-5
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