document.write( "Question 629684: David's gas tank is 1/6 full. After he buys 7 gallons of gas, it is 1/2 full. How many gallons can David's tank hold? \n" ); document.write( "
Algebra.Com's Answer #396426 by richwmiller(17219)\"\" \"About 
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x/6+7=x/2
\n" ); document.write( "multiply by 12
\n" ); document.write( "2x+84=6x
\n" ); document.write( "84=4x
\n" ); document.write( "21=x
\n" ); document.write( "check
\n" ); document.write( "21/6+7=21/2
\n" ); document.write( "10.5/3=10.5-7
\n" ); document.write( "10.5=3.5*3
\n" ); document.write( "ok\r
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