How many liters of 15% salt solution must be added to 2 liters of 30% salt solution to yield a solution that is 18%?

I am setting it up as follows..is this correct?

15% (x )liters =.15x 30%(2liters)=.30(2)=.6

The mixture would be: x +2(18)= .18(x +2)= .18x +.36

So, .15x + .6= .18x +.36

Am I right so far?

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