The Terezin's story was kept for so long because, they didn't want people to find out what happen there.
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"430 5" is not an equation and it does not have an unknown value. So there can be no equation which has the same unknown value.
unknown
You don't use unknown variables to solve an equation. The purpose of solving an equation is to find the value of the variable so that it's no longer unknown.
Unknown
let the unknown no be x so, 178+x=891 transposing, x=891-178 x=713 unknown no is 713