6. Calculate the value of "x"

\(A\) and \(B\) are two sets such that \(n(A – B) =\) 774, \(n(B – A) =\) 43 \(x\) and \(n(A ∩ B) =\) \(x\). Given that \(n(A) = n(B)\), calculate the value of \(x\).

 

 

The value of "\(x\)" is.