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8=z+8z
We move all terms to the left:
8-(z+8z)=0
We add all the numbers together, and all the variables
-(+9z)+8=0
We get rid of parentheses
-9z+8=0
We move all terms containing z to the left, all other terms to the right
-9z=-8
z=-8/-9
z=8/9
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