9  11 = x
The  signify absolute value. 9 is "decreased by" (subtracted by) 11. X is the variable, which is the solution. The solution to this problem is 2, not 2, because absolute value only includes real numbers, in other words, it is the distance away from zero. 9  11 = 2 but because we want an absolute value, x = 2 in the equation above.
8/28/2013

Clinton M.