document.write( "Question 965980: Shop A had twice as many laptops as Shop B.
\n" ); document.write( "After Shop A sold 450 laptops, Shop B had 3 times as many laptops as Shop A.
\n" ); document.write( "How many laptops did Shop A have at first?
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Algebra.Com's Answer #590403 by josgarithmetic(39623)\"\" \"About 
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ASSIGN VARIABLES
\n" ); document.write( "a, how many in shop A
\n" ); document.write( "b, how many in shop B
\n" ); document.write( "-
\n" ); document.write( "\"a=2b\"\r
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\n" ); document.write( "\n" ); document.write( "USE DESCRIPTION
\n" ); document.write( "\"a-450\" in store A;
\n" ); document.write( "None sold in store B;
\n" ); document.write( "\"3%28a-450%29=b\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "CREATE EQUATIONS or SYSTEM OF EQUATIONS
\n" ); document.write( "\"system%28a-2b%2C3%28a-450%29=b%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "SOLVE SYSTEM
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