After we add x liters of alcohol, 

1.  we will then have 2+x liters of alcohol.

And since alcohol is liquid, we begin with 28+2 liters
of liquid, and when we add x more liters of liquid alcohol,

2.  we will then have 28+2+x liters of liquid.





Multiply both sides by 30+x:













 liters of alcohol.

Edwin
 

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