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2+(2u+9)=50
We move all terms to the left:
2+(2u+9)-(50)=0
We add all the numbers together, and all the variables
(2u+9)-48=0
We get rid of parentheses
2u+9-48=0
We add all the numbers together, and all the variables
2u-39=0
We move all terms containing u to the left, all other terms to the right
2u=39
u=39/2
u=19+1/2
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