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-10z-2=-9z
We move all terms to the left:
-10z-2-(-9z)=0
We get rid of parentheses
-10z+9z-2=0
We add all the numbers together, and all the variables
-1z-2=0
We move all terms containing z to the left, all other terms to the right
-z=2
z=2/-1
z=-2
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