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-3(u+8)=39
We move all terms to the left:
-3(u+8)-(39)=0
We multiply parentheses
-3u-24-39=0
We add all the numbers together, and all the variables
-3u-63=0
We move all terms containing u to the left, all other terms to the right
-3u=63
u=63/-3
u=-21
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