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