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9-10z=-9z+2
We move all terms to the left:
9-10z-(-9z+2)=0
We get rid of parentheses
-10z+9z-2+9=0
We add all the numbers together, and all the variables
-1z+7=0
We move all terms containing z to the left, all other terms to the right
-z=-7
z=-7/-1
z=+7
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