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