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-u/2=42
We move all terms to the left:
-u/2-(42)=0
We multiply all the terms by the denominator
-u-42*2=0
We add all the numbers together, and all the variables
-1u-84=0
We move all terms containing u to the left, all other terms to the right
-u=84
u=84/-1
u=-84
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