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-10z-3=-9-9z
We move all terms to the left:
-10z-3-(-9-9z)=0
We add all the numbers together, and all the variables
-10z-(-9z-9)-3=0
We get rid of parentheses
-10z+9z+9-3=0
We add all the numbers together, and all the variables
-1z+6=0
We move all terms containing z to the left, all other terms to the right
-z=-6
z=-6/-1
z=+6
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