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8(u-3)-3u=21
We move all terms to the left:
8(u-3)-3u-(21)=0
We add all the numbers together, and all the variables
-3u+8(u-3)-21=0
We multiply parentheses
-3u+8u-24-21=0
We add all the numbers together, and all the variables
5u-45=0
We move all terms containing u to the left, all other terms to the right
5u=45
u=45/5
u=9
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