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-4u-9=-6-u
We move all terms to the left:
-4u-9-(-6-u)=0
We add all the numbers together, and all the variables
-4u-(-1u-6)-9=0
We get rid of parentheses
-4u+1u+6-9=0
We add all the numbers together, and all the variables
-3u-3=0
We move all terms containing u to the left, all other terms to the right
-3u=3
u=3/-3
u=-1
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