document.write( "Question 1013865: what is 2x+y=21 and x-y=6\r
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Algebra.Com's Answer #630160 by ikleyn(52781)\"\" \"About 
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\n" ); document.write( "what is 2x+y=21 and x-y=6
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\n" ); document.write( "\n" ); document.write( "It is the system of two equations in two unknowns.\r
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