Réponses

2014-03-05T14:21:36+01:00
(4x +3) -( x-5) = 3x - 2 
7x - ( 3+4x ) = 3x-3 
(3+4x ) -7x = -3x +3 
6x -3-(3x-6) = 
-(4x +5) - (-x) = -3x -5 
5x +3 -(-3 +5x) = 6