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31=u/12
We move all terms to the left:
31-(u/12)=0
We add all the numbers together, and all the variables
-(+u/12)+31=0
We get rid of parentheses
-u/12+31=0
We multiply all the terms by the denominator
-u+31*12=0
We add all the numbers together, and all the variables
-1u+372=0
We move all terms containing u to the left, all other terms to the right
-u=-372
u=-372/-1
u=+372
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