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-z-10=10+10+2z
We move all terms to the left:
-z-10-(10+10+2z)=0
We add all the numbers together, and all the variables
-z-(2z+20)-10=0
We add all the numbers together, and all the variables
-1z-(2z+20)-10=0
We get rid of parentheses
-1z-2z-20-10=0
We add all the numbers together, and all the variables
-3z-30=0
We move all terms containing z to the left, all other terms to the right
-3z=30
z=30/-3
z=-10
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