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24=2u+12
We move all terms to the left:
24-(2u+12)=0
We get rid of parentheses
-2u-12+24=0
We add all the numbers together, and all the variables
-2u+12=0
We move all terms containing u to the left, all other terms to the right
-2u=-12
u=-12/-2
u=+6
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