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-7u/2=21
We move all terms to the left:
-7u/2-(21)=0
We multiply all the terms by the denominator
-7u-21*2=0
We add all the numbers together, and all the variables
-7u-42=0
We move all terms containing u to the left, all other terms to the right
-7u=42
u=42/-7
u=-6
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