2X− = −1 X 3 10. 2 X− = +1 X 2 11. X− =1 2X−1 12. X− = −2 2 X

9. 2x− = −1 x 3 10. 2 x− = +1 x 2 11. x− =1 2x−1 12. x− = −2 2 x