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