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3.8z-7.8=0.2
We move all terms to the left:
3.8z-7.8-(0.2)=0
We add all the numbers together, and all the variables
3.8z-8=0
We move all terms containing z to the left, all other terms to the right
3.8z=8
z=8/3.8
z=2+0.4/3.8
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