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6=z-3.8
We move all terms to the left:
6-(z-3.8)=0
We get rid of parentheses
-z+3.8+6=0
We add all the numbers together, and all the variables
-1z+9.8=0
We move all terms containing z to the left, all other terms to the right
-z=-9.8
z=-9.8/-1
z=9+0.8/1
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