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u/5-7=13
We move all terms to the left:
u/5-7-(13)=0
We add all the numbers together, and all the variables
u/5-20=0
We multiply all the terms by the denominator
u-20*5=0
We add all the numbers together, and all the variables
u-100=0
We move all terms containing u to the left, all other terms to the right
u=100
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