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16=3u+24+5u
We move all terms to the left:
16-(3u+24+5u)=0
We add all the numbers together, and all the variables
-(8u+24)+16=0
We get rid of parentheses
-8u-24+16=0
We add all the numbers together, and all the variables
-8u-8=0
We move all terms containing u to the left, all other terms to the right
-8u=8
u=8/-8
u=-1
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