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2.1=-2u+27.7
We move all terms to the left:
2.1-(-2u+27.7)=0
We get rid of parentheses
2u-27.7+2.1=0
We add all the numbers together, and all the variables
2u-25.6=0
We move all terms containing u to the left, all other terms to the right
2u=25.6
u=25.6/2
u=12+1/1.25
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