Réponse :

Explications étape par étape

A= 3a + 5 -2a - 7 + 8 -5a

= 3a - 2a -5a + 8 - 7 +5

=  4a + 1 + 5

= 4a +6

B = -b +4 + 3b -2 - 8b +5

= -9b + 9 -2 +3b

= -6b +7

C = 6 -5c +3c -4+6c+5+7-2c

= -5c+6c-2c+3c+6-4+5+7

= -1c + 3c + 2 +12

= 4c + 14

D= d - 1 -3d -4 +5 -4d - 7d-5+5

= 3d +d +5-5-5+5-7d-4d

= 4d-11d