Răspuns :
(3x la a 3a-x la a 2a+3x-1)-4x la a doua(3x-2) +21x la a 3a+21 x=
=3x la a 3a-x la a 2a+3x -1-12x la a 3a+8x+21 x la a 3a+21x=
=12x la a 3a-x la a 2a+32x-1
cred ca e bine asa, verifica-l si tu
=3x la a 3a-x la a 2a+3x -1-12x la a 3a+8x+21 x la a 3a+21x=
=12x la a 3a-x la a 2a+32x-1
cred ca e bine asa, verifica-l si tu