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46=34+u
We move all terms to the left:
46-(34+u)=0
We add all the numbers together, and all the variables
-(u+34)+46=0
We get rid of parentheses
-u-34+46=0
We add all the numbers together, and all the variables
-1u+12=0
We move all terms containing u to the left, all other terms to the right
-u=-12
u=-12/-1
u=+12
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