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8.8u+2.1=2.3u-16.1
We move all terms to the left:
8.8u+2.1-(2.3u-16.1)=0
We get rid of parentheses
8.8u-2.3u+16.1+2.1=0
We add all the numbers together, and all the variables
6.5u+18.2=0
We move all terms containing u to the left, all other terms to the right
6.5u=-18.2
u=-18.2/6.5
u=-2+4.3333333333333/5.4166666666667
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