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u/3+6=13
We move all terms to the left:
u/3+6-(13)=0
We add all the numbers together, and all the variables
u/3-7=0
We multiply all the terms by the denominator
u-7*3=0
We add all the numbers together, and all the variables
u-21=0
We move all terms containing u to the left, all other terms to the right
u=21
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