Resposta:
2-a) 10ax+3bx-ax-11bx
10ax-ax+3bx-11bx
9ax-8bx+4x
b)15y-4z+3x +12y-20z
15y+12y-4z-20z+3x
27y-24z+3x
c)24aw+6x-12aw-6x
24aw-12aw+6x-6x
12aw
d)4x+5x+6x
15x
obs:Não sei as outras
