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u/5-6=9
We move all terms to the left:
u/5-6-(9)=0
We add all the numbers together, and all the variables
u/5-15=0
We multiply all the terms by the denominator
u-15*5=0
We add all the numbers together, and all the variables
u-75=0
We move all terms containing u to the left, all other terms to the right
u=75
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