2X-17-7x=7X+33-7x
-5x-17=33
-5x-17+17=33+17
-5x=50
两边除-5,得x=-10
5X+3-x=X-1-x4x+3=-14x+3-3=-1-34x=-4x=-1
3.4X-9.8=1.4X-9Z+2/7=4/9Z-3/7
3.4X-9.8-1.4x=1.4X-9-1.4x2x-9.8=-92x-9.8+9.8=-9+9.82x=0.8x=0.4Z+2/7-4/9z=4/9Z-3/7-4/9z5/9z+2/7=-3/75/9z+2/7-2/7=-3/7-2/75/9z=-5/7z=-1/7*9=-9/7