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8(u+8)+3u=31
We move all terms to the left:
8(u+8)+3u-(31)=0
We add all the numbers together, and all the variables
3u+8(u+8)-31=0
We multiply parentheses
3u+8u+64-31=0
We add all the numbers together, and all the variables
11u+33=0
We move all terms containing u to the left, all other terms to the right
11u=-33
u=-33/11
u=-3
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