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12=23-z
We move all terms to the left:
12-(23-z)=0
We add all the numbers together, and all the variables
-(-1z+23)+12=0
We get rid of parentheses
1z-23+12=0
We add all the numbers together, and all the variables
z-11=0
We move all terms containing z to the left, all other terms to the right
z=11
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