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21=u/2-12
We move all terms to the left:
21-(u/2-12)=0
We get rid of parentheses
-u/2+12+21=0
We multiply all the terms by the denominator
-u+12*2+21*2=0
We add all the numbers together, and all the variables
-1u+66=0
We move all terms containing u to the left, all other terms to the right
-u=-66
u=-66/-1
u=+66
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