document.write( "Question 317280: b is the midpoint of ac. prove ab + cd = ab \n" ); document.write( "
Algebra.Com's Answer #227139 by Fombitz(32388)\"\" \"About 
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Check your equation.
\n" ); document.write( "\"ab%2Bcd=ab\"
\n" ); document.write( "only when \"cd=0\" since \"ab=ab\".
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