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51=-u/8
We move all terms to the left:
51-(-u/8)=0
We get rid of parentheses
u/8+51=0
We multiply all the terms by the denominator
u+51*8=0
We add all the numbers together, and all the variables
u+408=0
We move all terms containing u to the left, all other terms to the right
u=-408
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