1. 6X-5=13X+13
2. 4X+5=6X+9
3. -10X+8=3X+5
1. 6X-5=13X+13
2. 4X+5=6X+9
3. -10X+8=3X+5
1. 6X-5=13X+13
-5-13=13X-6X
7x=-18
x=-18/7
2. 4X+5=6X+9
5-9=6x-4x
2x=-4
x=-2
3. -10X+8=3X+5
8-5=3x+10x
13x=3
x=3/13
1.解: 6X-5=13X+13
...........移项,得6x-13x=13+5
..........合并同类项,得-7x=18
............方程两边同除以-7,解得x=-7/18
2.解: 4X+5=6X+9
...........移项,得4x-6x=9-5
..........合并同类项,得-2x=4
............方程两边同除以-2,解得x=-2
3.解: -10X+8=3X+5
...........移项,得-10x-3x=5-8
..........合并同类项,得-13x=-3
............方程两边同除以-13,解得x=3/13
1)x=-18/7
2)x=-2
3)x=3/13