Упростите выражение 4x-(5x-(1-x)).

\[4x - \left( 5x - (1 - x) \right) = 4x - 5x + (1 - x) =\]

\[= 4x - 5x + 1 - x = 1 - 2x.\]

\[Ответ:\ 1 - 2x.\]