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3(2u+8)=30

We move all terms to the left:

3(2u+8)-(30)=0

We multiply parentheses

6u+24-30=0

We add all the numbers together, and all the variables

6u-6=0

We move all terms containing u to the left, all other terms to the right

6u=6

u=6/6

u=1

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