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29=22+u
We move all terms to the left:
29-(22+u)=0
We add all the numbers together, and all the variables
-(u+22)+29=0
We get rid of parentheses
-u-22+29=0
We add all the numbers together, and all the variables
-1u+7=0
We move all terms containing u to the left, all other terms to the right
-u=-7
u=-7/-1
u=+7
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