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-2.7+u/3=-21.9
We move all terms to the left:
-2.7+u/3-(-21.9)=0
We add all the numbers together, and all the variables
u/3+19.2=0
We multiply all the terms by the denominator
u+(19.2)*3=0
We add all the numbers together, and all the variables
u+57.6=0
We move all terms containing u to the left, all other terms to the right
u=-57.6
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