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16=21-u
We move all terms to the left:
16-(21-u)=0
We add all the numbers together, and all the variables
-(-1u+21)+16=0
We get rid of parentheses
1u-21+16=0
We add all the numbers together, and all the variables
u-5=0
We move all terms containing u to the left, all other terms to the right
u=5
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