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9.9-3u=2.4
We move all terms to the left:
9.9-3u-(2.4)=0
We add all the numbers together, and all the variables
-3u+7.5=0
We move all terms containing u to the left, all other terms to the right
-3u=-7.5
u=-7.5/-3
u=2+1/2
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