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13u-19=17u-39
We move all terms to the left:
13u-19-(17u-39)=0
We get rid of parentheses
13u-17u+39-19=0
We add all the numbers together, and all the variables
-4u+20=0
We move all terms containing u to the left, all other terms to the right
-4u=-20
u=-20/-4
u=+5
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