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-6.1=u/6+13.1
We move all terms to the left:
-6.1-(u/6+13.1)=0
We get rid of parentheses
-u/6-13.1-6.1=0
We multiply all the terms by the denominator
-u-(13.1)*6-(6.1)*6=0
We add all the numbers together, and all the variables
-1u-115.2=0
We move all terms containing u to the left, all other terms to the right
-u=115.2
u=115.2/-1
u=-115+0.2/1
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