Jawapan

2016-01-09T21:18:04+08:00
6 + 5x = 2x - 9
5x - 2x = -9 - 6
  3x ÷ 3 = -15 ÷ 3
          x = -5

Check:
6 + 5(-5) = 2(-5) - 9
6 + (-25) = (-10) - 9
          -19 = -19

2016-01-10T14:22:23+08:00
3. 6 + 5x = 2x - 9 

Then, solve for x for each problem to get...
 
 3x = -15 
x = -5