Question

x igual a menos x sobre 2 menos 6x menos 9

Answer 1

x = - x  - 6x - 9 
       2

2x = - x - 12x - 18
 2               2

2x = - x - 12x - 18
2x = - 13x - 18
2x + 13x = - 18
15x = - 18 (:3)
5x = - 6
x = - 6/5