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-9=8+u
We move all terms to the left:
-9-(8+u)=0
We add all the numbers together, and all the variables
-(u+8)-9=0
We get rid of parentheses
-u-8-9=0
We add all the numbers together, and all the variables
-1u-17=0
We move all terms containing u to the left, all other terms to the right
-u=17
u=17/-1
u=-17
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