document.write( "Question 243415: Let a + b + c + d = 29 a + c = 13 and a + b + d = 19 what is the value of a ? \n" ); document.write( "
Algebra.Com's Answer #178360 by Alan3354(69443)\"\" \"About 
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Let a + b + c + d = 29 a + c = 13 and a + b + d = 19 what is the value of a ?
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\n" ); document.write( "c = 13-a
\n" ); document.write( "b+d = 19-a
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\n" ); document.write( "a + (13-a) + (19-a) = 29
\n" ); document.write( "-a + 32 = 29
\n" ); document.write( "-a = -3
\n" ); document.write( "a = 3
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