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68=8+3u
We move all terms to the left:
68-(8+3u)=0
We add all the numbers together, and all the variables
-(3u+8)+68=0
We get rid of parentheses
-3u-8+68=0
We add all the numbers together, and all the variables
-3u+60=0
We move all terms containing u to the left, all other terms to the right
-3u=-60
u=-60/-3
u=+20
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