document.write( "Question 1192773: How many liters of pure alcohol must be added to a 4-liter 50% solution to make 70% solution? Solve using algebra.
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Algebra.Com's Answer #824670 by josgarithmetic(39617)\"\" \"About 
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\"%28x%2B4%2A%280.5%29%29%2F%28x%2B4%29=0.7\"\r
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