yes it is.. it means capable of being known..
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ambiguous, hidden, mystic, unknowable
If you mean: 4x-4+3*(3.14) then the expression can be simplified to 4x+5.42 whereas x is an unknown variable
abstruse, alchemistic, arcane, astrological, baffling, cabalistic, covert, cryptic, curious, dark, difficult, enigmatic, enigmatical, equivocal, esoteric, furtive, hidden, impenetrable, incomprehensible, inexplicable, inscrutable, insoluble, magical, mystical, mystifying, necromantic, obscure, occult, oracular, perplexing, puzzling, recondite, secretive, sphinxlike, spiritual, strange, subjective, symbolic, transcendental, uncanny, unfathomable, unknowable, unknown, unnatural, veiled, weird .
As so many different language translations exist, and as, within those languages, so many different versions exist, and as, within those versions, so many printings exist.... this number is unknown and unknowable.
If you are looking for a total number of people who have died as the result of gun shots since guns were first invented, that would be a worldwide statistic over several centuries and would be unknowable. If you are looking for annual firearm-related deaths in the United States, the Center for Disease Control (CDC) has statistics for 2013: 33,636