Find an equation for the nth term of the arithmetic sequence. - 20, - 16, - 12, - 8, ...

Options:

an = - 20 x 4 (n - 1)

an = - 20 + 4 (n - 1)

an = - 20 + 4 (n + 2)

an = - 20 + 4 (n + 1)

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