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18.6=z-3.8
We move all terms to the left:
18.6-(z-3.8)=0
We get rid of parentheses
-z+3.8+18.6=0
We add all the numbers together, and all the variables
-1z+22.4=0
We move all terms containing z to the left, all other terms to the right
-z=-22.4
z=-22.4/-1
z=22+0.4/1
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