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-13.8=u/5-1.3
We move all terms to the left:
-13.8-(u/5-1.3)=0
We get rid of parentheses
-u/5+1.3-13.8=0
We multiply all the terms by the denominator
-u+(1.3)*5-(13.8)*5=0
We add all the numbers together, and all the variables
-1u-62.5=0
We move all terms containing u to the left, all other terms to the right
-u=62.5
u=62.5/-1
u=-62+0.5/1
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