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-3u+8(u+8)=29
We move all terms to the left:
-3u+8(u+8)-(29)=0
We multiply parentheses
-3u+8u+64-29=0
We add all the numbers together, and all the variables
5u+35=0
We move all terms containing u to the left, all other terms to the right
5u=-35
u=-35/5
u=-7
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