document.write( "Question 159250: If 7 x's = 2 y's and 3 y's =5 z's then 21 x's = ___z's \n" ); document.write( "
Algebra.Com's Answer #117411 by t_as87(5)\"\" \"About 
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If 7 x = 2 y (multiply both sides by 3)
\n" ); document.write( "you get 21 x = 6 y
\n" ); document.write( "and since 3 y = 5 z (multiply both sides by 2)
\n" ); document.write( "you get 6 y = 10 z
\n" ); document.write( "SO
\n" ); document.write( "21 x = 10 z!
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