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bonjour

A = 2 x + 7

B = 3 - x

C = ( 2 x - 5 ) / ( x + 1 )

B - C

=  2 x + 7 - ( 3 - x )

= 2 x + 7 - 3 + x

= 3 x + 4

C  - 1 /A

= ( 2 x - 5 ) / ( x + 1 ) -  1 / ( 2 x + 7 )

=  ( 2 x - 5 ) ( 2 x + 7 ) / ( x + 1 ) ( 2 x + 7 ) -  [ 1 ( x + 1 ) / ( x + 1 ) ( 2 x + 7)]

=   2 x - 5 - 1

= 2 x - 6