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13=u/6+5
We move all terms to the left:
13-(u/6+5)=0
We get rid of parentheses
-u/6-5+13=0
We multiply all the terms by the denominator
-u-5*6+13*6=0
We add all the numbers together, and all the variables
-1u+48=0
We move all terms containing u to the left, all other terms to the right
-u=-48
u=-48/-1
u=+48
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