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-16.9+2.8u=4.1u
We move all terms to the left:
-16.9+2.8u-(4.1u)=0
We add all the numbers together, and all the variables
2.8u-(+4.1u)-16.9=0
We get rid of parentheses
2.8u-4.1u-16.9=0
We add all the numbers together, and all the variables
-1.3u-16.9=0
We move all terms containing u to the left, all other terms to the right
-1.3u=16.9
u=16.9/-1.3
u=-12+1/1
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