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