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(5+u)2=289
We move all terms to the left:
(5+u)2-(289)=0
We add all the numbers together, and all the variables
(u+5)2-289=0
We multiply parentheses
2u+10-289=0
We add all the numbers together, and all the variables
2u-279=0
We move all terms containing u to the left, all other terms to the right
2u=279
u=279/2
u=139+1/2
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