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u/7+48=57
We move all terms to the left:
u/7+48-(57)=0
We add all the numbers together, and all the variables
u/7-9=0
We multiply all the terms by the denominator
u-9*7=0
We add all the numbers together, and all the variables
u-63=0
We move all terms containing u to the left, all other terms to the right
u=63
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