document.write( "Question 1144730: The sum of 3 numbers is 30. The sum of the first and second is twice the third. The sun of the second and third is 3 more than twice the first. What is the third number? \n" ); document.write( "
Algebra.Com's Answer #765906 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
first x
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\n" ); document.write( "\"system%28x%2By%2Bz=30%2Cx%2By=2z%2C2x%2B3=y%2Bz%29\"\r
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\n" ); document.write( "\n" ); document.write( "First two equations
\n" ); document.write( "\"system%28x%2By=30-z%2Cx%2By=2z%29\"\r
\n" ); document.write( "\n" ); document.write( "\"30-z=2z\"\r
\n" ); document.write( "\n" ); document.write( "\"30=3z\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight_green%28z=10%29\"
\n" ); document.write( "The third number found.\r
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\n" ); document.write( "\n" ); document.write( "(Better to continue solve for x and y and check if solution for x,y,z work in the system, and in last equation of original description)
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