\Leftrightarrow x - \left \{ 57 - \left [ 42 - 23 - x \right ] \right \} = 13 - \left \{ 47 + \left [ 25 - 32 + x \right ] \right \}
\Leftrightarrow x - \left \{ 57 - 19 + x \right \} = 13 - \left \{ 47 - 7 + x \right \}
\Leftrightarrow x - 38 - x= 13 - 40 - x \Leftrightarrow x = 11