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u/3-1=7
We move all terms to the left:
u/3-1-(7)=0
We add all the numbers together, and all the variables
u/3-8=0
We multiply all the terms by the denominator
u-8*3=0
We add all the numbers together, and all the variables
u-24=0
We move all terms containing u to the left, all other terms to the right
u=24
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