document.write( "Question 529860: I have a math problem I don't understand how to do it 5x+2x-9=40 \n" ); document.write( "

Algebra.Com's Answer #349779 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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5x + 2x - 9 = 40
\n" ); document.write( "combine like terms, add the x's
\n" ); document.write( "7x - 9 = 40
\n" ); document.write( "add 9 to both sides
\n" ); document.write( "7x - 9 + 9 = 40 + 9
\n" ); document.write( "7x = 49
\n" ); document.write( "divide both sides by 7
\n" ); document.write( "x = $\"49%2F7\"$
\n" ); document.write( "x = 7
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check solution in original equation
\n" ); document.write( "5x + 2x - 9 = 40
\n" ); document.write( "5(7) + 2(7) - 9 = 40
\n" ); document.write( "35 + 14 - 9 = 40
\n" ); document.write( "49 - 9 = 40; confirms our solution of x=7 \n" ); document.write( "

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