Find the value(s) of $x$:$|x|=3$$|x|=6$$|x|=-7$$|x|=0$$|x|=17$$|x|=-21$$-|x|=3$$-|x|=-9$$-|x|=0$$|x|=-12$$|x|=13$$|x|=4-9$ Answer Key: Absolute Value (with variables)