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You can put this solution on YOUR website!
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document.write( "We follow PE(MD)(AS) rules. We do just one thing and copy everything\r\n" );
document.write( "else over.\r\n" );
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document.write( "20-[9-{7+(2*3)}+5]\r\n" );
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document.write( "The innermost parentheses is (2*3)\r\n" );
document.write( "Replace only the (2*3) with 6 and copy everything else over.\r\n" );
document.write( "\r\n" );
document.write( "20-[9-{7+6}+5]\r\n" );
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document.write( "Now the innermost parentheses is (7+6)\r\n" );
document.write( "Replace only the (7+6) with 13 and copy everything else over.\r\n" );
document.write( "\r\n" );
document.write( "20-[9-13+5]\r\n" );
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document.write( "Now the innermost parentheses is [9-13+5]. But it contains three\r\n" );
document.write( "numbers to operate with. Do only the leftmost of the addition or\r\n" );
document.write( "subtraction. That is, replace only the 9-13 with -4 and copy \r\n" );
document.write( "everything else over.\r\n" );
document.write( "\r\n" );
document.write( "20-[-4+5]\r\n" );
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document.write( "The innermost parentheses is [-4+5]\r\n" );
document.write( "Replace only the [-4+5) with 1 and copy everything else over.\r\n" );
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document.write( "20-1\r\n" );
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document.write( "19.\r\n" );
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document.write( "Edwin\n" ); document.write( " \n" ); document.write( "