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u+13=2u-10
We move all terms to the left:
u+13-(2u-10)=0
We get rid of parentheses
u-2u+10+13=0
We add all the numbers together, and all the variables
-1u+23=0
We move all terms containing u to the left, all other terms to the right
-u=-23
u=-23/-1
u=+23
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