task/29414017 - --------------------
(4x+1)(x+5) - (2x+1)(2x -3) =58 ;
4x² +20x +x +5 - (4x² -6x +2x -3) =58 ; * * * 25x = 50 * * *
4x² +21x +5 - (4x² -4x -3) =58 ;
4x² +21x +5 - 4x² + 4x +3 =58 ;
25x +8 =58 ;
25x =58 -8 ;
25x =50 ;
x = 50/25 =2.
ответ : 2.