คำตอบ

  • mumuay
  • ผู้ใฝ่รู้
2014-02-19T21:59:40+07:00
1) 3(2x-3) - (2x+2) = x-3
6x - 9 - 2x -2 = x-3
4x - 11 = x -3
4x - x = -3 + 11
3x = 8
x = 8/3

2) 4x = 7+3x
4x - 3x = 7
x = 7

3) 8 + 3a = 11
3a = 11-8
3a = 3
a = 1