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2(2u+9)=40
We move all terms to the left:
2(2u+9)-(40)=0
We multiply parentheses
4u+18-40=0
We add all the numbers together, and all the variables
4u-22=0
We move all terms containing u to the left, all other terms to the right
4u=22
u=22/4
u=5+1/2
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