document.write( "Question 1013841: If a:b =c:d =5:7, find (a+c):(b+d). \n" ); document.write( "
Algebra.Com's Answer #630122 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( " If \"a%3Ab+=c%3Ad+=5%3A7\", find \"%28a%2Bc%29%3A%28b%2Bd%29\"\r
\n" ); document.write( "\n" ); document.write( " \"a%3Ab+=5%3A7\"\r
\n" ); document.write( "\n" ); document.write( "\"7a=5b\"\r
\n" ); document.write( "\n" ); document.write( "\"a=5b%2F7\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \"c%3Ad+=5%3A7\"\r
\n" ); document.write( "\n" ); document.write( "\"7c=5d\"\r
\n" ); document.write( "\n" ); document.write( "\"c=5d%2F7\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "=>
\n" ); document.write( "\"%28a%2Bc%29%3A%28b%2Bd%29\"\r
\n" ); document.write( "\n" ); document.write( "=\"%285b%2F7%2B5d%2F7%29%3A%28b%2Bd%29\"\r
\n" ); document.write( "\n" ); document.write( "=\"%28%285b%2B5d%29%2F7%29%3A%28b%2Bd%29\"\r
\n" ); document.write( "\n" ); document.write( "=\"%285%28b%2Bd%29%29%2F7%29%3A%28b%2Bd%29\"\r
\n" ); document.write( "\n" ); document.write( "=\"%285%28b%2Bd%29%29%2F7%29%2F%28b%2Bd%29\"\r
\n" ); document.write( "\n" ); document.write( "=\"5%28b%2Bd%29%2F7%28b%2Bd%29\"\r
\n" ); document.write( "\n" ); document.write( "=\"5%2F7\"\r
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