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2(u+3)+1=19
We move all terms to the left:
2(u+3)+1-(19)=0
We add all the numbers together, and all the variables
2(u+3)-18=0
We multiply parentheses
2u+6-18=0
We add all the numbers together, and all the variables
2u-12=0
We move all terms containing u to the left, all other terms to the right
2u=12
u=12/2
u=6
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