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2(3+u)=16
We move all terms to the left:
2(3+u)-(16)=0
We add all the numbers together, and all the variables
2(u+3)-16=0
We multiply parentheses
2u+6-16=0
We add all the numbers together, and all the variables
2u-10=0
We move all terms containing u to the left, all other terms to the right
2u=10
u=10/2
u=5
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