document.write( "Question 570833: Twice the sum of a number and 3 is 18. Find the number. \n" ); document.write( "
Algebra.Com's Answer #368577 by mathsmiles(68)![]() ![]() You can put this solution on YOUR website! Let's take this one part at a time. \r \n" ); document.write( "\n" ); document.write( "Let X be the number we're looking for.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Take the sum of this number and 3: \n" ); document.write( "X+3 \n" ); document.write( "Two times this: \n" ); document.write( "2(X+3) \n" ); document.write( "is 18\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "So the equation is \n" ); document.write( "2(X + 3) = 18 \n" ); document.write( "2X + 6 = 18\r \n" ); document.write( "\n" ); document.write( "Subtract 6 from each side giving: \n" ); document.write( "2X = 12\r \n" ); document.write( "\n" ); document.write( "Divide both sides by 2 giving: \n" ); document.write( "X = 6\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Checking: \n" ); document.write( "The sum of 6 and 3 is 9 \n" ); document.write( "Twice that is 9 X 2 = 18 Correct! \n" ); document.write( " |