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-9-10u=-5-9u
We move all terms to the left:
-9-10u-(-5-9u)=0
We add all the numbers together, and all the variables
-10u-(-9u-5)-9=0
We get rid of parentheses
-10u+9u+5-9=0
We add all the numbers together, and all the variables
-1u-4=0
We move all terms containing u to the left, all other terms to the right
-u=4
u=4/-1
u=-4
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