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