2X-17-7x=7X+33-7x
-5x-17=33
-5x-17+17=33+17
-5x=50
两边除-5,得x=-105X+3=X-15X+3-x=X-1 -x4x+3=-1 4x+3-3=-1-3 4x=-4 x=-13.4X-9.8=1.4X-9Z+2/7=4/9Z-3/73.4X-9.8-1.4x=1.4X-9-1.4x2x-9.8=-9 2x-9.8+9.8=-9+9.82x=0.8x=0.4 Z+2/7-4/9z=4/9Z-3/7-4/9z5/9z+2/7=-3/7 5/9z+2/7-2/7=-3/7-2/75/9z=-5/7z=-1/7*9=-9/7