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13=2u-17
We move all terms to the left:
13-(2u-17)=0
We get rid of parentheses
-2u+17+13=0
We add all the numbers together, and all the variables
-2u+30=0
We move all terms containing u to the left, all other terms to the right
-2u=-30
u=-30/-2
u=+15
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