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