How to solve: T(n) = T(n/2) + T(n/4) + T(n/8) + (n)

I know how to do recurrence relations for algorithms that only call itself once, but I’m not sure how to do something that calls itself multiple times in one occurrence.

For example:

T(n) = T(n/2) + T(n/4) + T(n/8) + (n)

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