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