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3.8=z+2.5
We move all terms to the left:
3.8-(z+2.5)=0
We get rid of parentheses
-z-2.5+3.8=0
We add all the numbers together, and all the variables
-1z+1.3=0
We move all terms containing z to the left, all other terms to the right
-z=-1.3
z=-1.3/-1
z=1+0.3/1
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