X eludes me.....

To anyone else studying for the math portion of a standardized test... I salute you. We, verbal folk, are not meant for these calculations and data sufficiency questions... We are the people of reading comprehension, essay writing, and sentence correction.  Yes I do know the difference between their, there and they're and I know the difference between postulate, pontificate, and predicate.... but I do not and might not ever know what "x" is....at least for today.