document.write( "Question 17668: 21 X 2 - 54 / 9\r
\n" ); document.write( "\n" ); document.write( "The agruement is the order in which the expression is calculated. \n" ); document.write( "
Algebra.Com's Answer #8524 by mmm4444bot(95)\"\" \"About 
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Hello There:\r
\n" ); document.write( "\n" ); document.write( "I'm going to assume that the letter 'X' means multiplication instead of representing a variable. In the future, you should consider using an asterisk to denote multiplication, since the letter x is used almost exclusively as a variable.\r
\n" ); document.write( "\n" ); document.write( "Having said this, I will retype your expression:\r
\n" ); document.write( "\n" ); document.write( "21 * 2 - 54 / 9\r
\n" ); document.write( "\n" ); document.write( "The order of operations tells us to do multiplication and division before doing addition and subtraction.\r
\n" ); document.write( "\n" ); document.write( "So, working from left to right, we first need to do 21 * 2 and 54 / 9.\r
\n" ); document.write( "\n" ); document.write( "21 * 2 = 42\r
\n" ); document.write( "\n" ); document.write( "54 / 9 = 6\r
\n" ); document.write( "\n" ); document.write( "Substituting these values into your expression leads to:\r
\n" ); document.write( "\n" ); document.write( "42 - 6\r
\n" ); document.write( "\n" ); document.write( "So, the final result is 36.\r
\n" ); document.write( "\n" ); document.write( "~ Mark
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