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-19.77+13.1u+9.56=15u+11.45
We move all terms to the left:
-19.77+13.1u+9.56-(15u+11.45)=0
We add all the numbers together, and all the variables
13.1u-(15u+11.45)-10.21=0
We get rid of parentheses
13.1u-15u-11.45-10.21=0
We add all the numbers together, and all the variables
-1.9u-21.66=0
We move all terms containing u to the left, all other terms to the right
-1.9u=21.66
u=21.66/-1.9
u=-11+0.76/1.9
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