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u/5+17=20
We move all terms to the left:
u/5+17-(20)=0
We add all the numbers together, and all the variables
u/5-3=0
We multiply all the terms by the denominator
u-3*5=0
We add all the numbers together, and all the variables
u-15=0
We move all terms containing u to the left, all other terms to the right
u=15
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