Développe et réduis les expressions suivantes :
A= -3x(2x+4)-x(2-3x)
B= -3x( x au carré +7)+(6x-1)-x(15+7x)-3
C= (3x+2)(-6y+4)
D=(2x+5)(3x-4)+(-2x+3)(-5x-2)

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