Bonsoir,
E=(-3+y)*9
=-3*9+9y
E=9y-27
F=-6(2x-7)
=-6*2x-6*(-7)
F=-12x+42
G=-8z(4-3z)
=-8z*4-8z*(-3z)
G=24z²-32z
H=3y(-4+6y)
=-4*3y+6y*3y
H=18y²-12y
I=11+2(x-6)+4(-3x-6)
=11+2x-12-12x-24
I=-10x-25
J=-2(x-5)-3(7-4x)
=-2x+10-21+12x
J=10x-11
K=-7y-4(3y-6)+3+2(3y-7)
=-7y-12y+24+3+6y-14
K=-13y+13