## DESCRIPTION
## Algebra and Number Theory: Algebra
## ENDDESCRIPTION

## KEYWORDS('algebra', 'number', 'theory')
## Tagged by YJ

## Date('5/26/2005')
## Author('Jeff Holt')
## Institution('UVA')
## TitleText1('Calculus')
## EditionText1('5e')
## AuthorText1('Stewart')
## Section1('3.1')
## Problem1('3')

DOCUMENT();        # This should be the first executable line in the problem.

loadMacros(
"PG.pl",
"PGbasicmacros.pl",
"PGchoicemacros.pl",
"PGanswermacros.pl",
"PGauxiliaryFunctions.pl",
"PGasu.pl",
"extraAnswerEvaluators.pl"
);

TEXT(beginproblem());
$showPartialCorrectAnswers = 0;

$a = random(1,5,1);
$b = non_zero_random(-10,10,1);
$c = random(6,10,1);
$d = non_zero_random(-10,10,1);

TEXT(EV2(<<EOT));
Solve the following equation. 
$BR
\[ |$a x + $b | = |$c x +$d|  \]
$BR
Answer: \{ans_rule(35) \}
$BR
$BBOLD Note: $EBOLD
 If there is more than one answer, write them separated by commas (e.g., 1, 2). 
EOT
$e=$d-$b;
$f=$a-$c;
$g=-$d-$b;
$h=$a+$c;
$ans1 = "$e/$f";
$ans2= "$g/$h";
ANS(number_list_cmp("$ans1,$ans2"));


ENDDOCUMENT();        # This should be the last executable line in the problem.;