Calculate the value of "x" — task. Mathematics State Board, Class 9.

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$A$ 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.

$1$

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