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34=25+u
We move all terms to the left:
34-(25+u)=0
We add all the numbers together, and all the variables
-(u+25)+34=0
We get rid of parentheses
-u-25+34=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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