Réduire les expressions suivantes :
A = (2x+3)+(3x+1)
B = (-5x+2)-(4+3x)
C = (7x+2y)-(3x-4y)+5
D = 9x²-7+(3x²-5+2x)-4x+2
A = (2x+3)+(3x+1)
B = (-5x+2)-(4+3x)
C = (7x+2y)-(3x-4y)+5
D = 9x²-7+(3x²-5+2x)-4x+2
