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-10=8+3u
We move all terms to the left:
-10-(8+3u)=0
We add all the numbers together, and all the variables
-(3u+8)-10=0
We get rid of parentheses
-3u-8-10=0
We add all the numbers together, and all the variables
-3u-18=0
We move all terms containing u to the left, all other terms to the right
-3u=18
u=18/-3
u=-6
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