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-5.1+3u=2.4
We move all terms to the left:
-5.1+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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