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24=7u+u
We move all terms to the left:
24-(7u+u)=0
We add all the numbers together, and all the variables
-(+8u)+24=0
We get rid of parentheses
-8u+24=0
We move all terms containing u to the left, all other terms to the right
-8u=-24
u=-24/-8
u=+3
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