乘以6得 8-48x=18-33x-48x+33x=18-8-15x=10x=-3分之2
-8X+11/2X=3-4/3-5/2X=5/3X=-2/3
8x-(11/2)x=4/3-3,(8-11/2)x=(5/2)x=-5/3,x=-2/3