document.write( "Question 175086: 15x + 20y = 400\r
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Algebra.Com's Answer #130180 by Alan3354(69443)\"\" \"About 
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15x + 20y = 400
\n" ); document.write( "What is the process to solve this equation for x and y?
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\n" ); document.write( "It's not possible. When you have 2 unknowns, you need 2 equations.
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