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13=1-(2u)
We move all terms to the left:
13-(1-(2u))=0
We add all the numbers together, and all the variables
-(-2u+1)+13=0
We get rid of parentheses
2u-1+13=0
We add all the numbers together, and all the variables
2u+12=0
We move all terms containing u to the left, all other terms to the right
2u=-12
u=-12/2
u=-6
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