(1)x=-16
(2)x=-17/18
(3)x=50/9过程1/3x+1/3=2/7x-3/7 -3x =3+1/6-1/3 0.1x+10-x-2=31/3x-2/7x=-1/3-3/7-3x =17/6 -0.9x =3-81/21x= -16/21 x= - 17/18-0.9x = -5 x=-16/21*21x=50/9x= - 16