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47=u/7+42
We move all terms to the left:
47-(u/7+42)=0
We get rid of parentheses
-u/7-42+47=0
We multiply all the terms by the denominator
-u-42*7+47*7=0
We add all the numbers together, and all the variables
-1u+35=0
We move all terms containing u to the left, all other terms to the right
-u=-35
u=-35/-1
u=+35
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