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-1-9u=-9-10u
We move all terms to the left:
-1-9u-(-9-10u)=0
We add all the numbers together, and all the variables
-9u-(-10u-9)-1=0
We get rid of parentheses
-9u+10u+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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