write it out

l 9 -11 l = x

-9 +11 = X , X =2

l 9 -11l = l -2 l = 2

x = 2 is the only answer.

write it out

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Woodland Hills, CA

l 9 -11 l = x

-9 +11 = X , X =2

l 9 -11l = l -2 l = 2

x = 2 is the only answer.

Lehi, UT

|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.

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