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4=-18+2z
We move all terms to the left:
4-(-18+2z)=0
We add all the numbers together, and all the variables
-(2z-18)+4=0
We get rid of parentheses
-2z+18+4=0
We add all the numbers together, and all the variables
-2z+22=0
We move all terms containing z to the left, all other terms to the right
-2z=-22
z=-22/-2
z=+11
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