document.write( "Question 421135: solve
\n" ); document.write( "v^2-4v-21=0
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Algebra.Com's Answer #294126 by mananth(16946)\"\" \"About 
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v^2-4v-21=0\r
\n" ); document.write( "\n" ); document.write( "v^2-7v+3v-21=0
\n" ); document.write( "v(v-7)+3(v-7)=0
\n" ); document.write( "(v-7)(v+3)=0
\n" ); document.write( "v=7 OR v=-3
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