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19=u/3+13
We move all terms to the left:
19-(u/3+13)=0
We get rid of parentheses
-u/3-13+19=0
We multiply all the terms by the denominator
-u-13*3+19*3=0
We add all the numbers together, and all the variables
-1u+18=0
We move all terms containing u to the left, all other terms to the right
-u=-18
u=-18/-1
u=+18
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