Which formula can be used to describe the sequence?

-2 2/3, - 5 1/3, - 10 2/3, - 21 1/3, - 42 2/3.

A: f (x + 1) = - 2f (x)

B: f (x + 1) = - 1/2 f (x)

C: f (x + 1) = 1/2 f (x)

D: f (x + 1) = 2f (x)

Solve for x. -2 (x - 3) 2 + 170 = - 168

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Can you guys give me step by step on how to solve this ... ik the answer. "infinitely many solutions" I need the STEPS 5 + x - 12 = x - 7