6. 4X - 13.6X + 6.9X = 0 4) 76-X = X + 2

3) - TUYEN TAP CAC BAI PT VA BPT MU QUA CAC DE THI DH
TUYEN TAP CAC BAI PT VA BPT MU QUA CAC DE THI DH

3) 6. 4

x

- 13.6

x

+ 6.9

x

= 0 4) 7

6-x

= x + 2