Answers

2016-06-25T02:02:21+08:00
1. 5x+9-6x+7=0
-x+16=0
2.-2x+3-3-2x=0
-4x=0
3. -3a+2b-3b+3a=0
-b=0
4. 4a+5b-6a+7b=0
-2a+13b=0
0