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-20-2z=18z-20-20z
We move all terms to the left:
-20-2z-(18z-20-20z)=0
We add all the numbers together, and all the variables
-2z-(-2z-20)-20=0
We get rid of parentheses
-2z+2z+20-20=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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