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-9z=-9-10z
We move all terms to the left:
-9z-(-9-10z)=0
We add all the numbers together, and all the variables
-9z-(-10z-9)=0
We get rid of parentheses
-9z+10z+9=0
We add all the numbers together, and all the variables
z+9=0
We move all terms containing z to the left, all other terms to the right
z=-9
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