Answer:
[tex]x = - 4[/tex]
Step-by-step explanation:
[tex]-40 + 2x = 4x - 8(x + 8) \\ 2x - 40 = 4x - 8x - 64 \\ 2x + 8x - 4x = 40 - 64 \\ 6x = - 24 \\ x = - \frac{ 24}{6} \\ x = - 4[/tex]