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42.5-3u=4.1
We move all terms to the left:
42.5-3u-(4.1)=0
We add all the numbers together, and all the variables
-3u+38.4=0
We move all terms containing u to the left, all other terms to the right
-3u=-38.4
u=-38.4/-3
u=12+2.4/3
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