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8z-7=6z-9
We move all terms to the left:
8z-7-(6z-9)=0
We get rid of parentheses
8z-6z+9-7=0
We add all the numbers together, and all the variables
2z+2=0
We move all terms containing z to the left, all other terms to the right
2z=-2
z=-2/2
z=-1
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