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# Suppose that the function f has derivatives of all orders at x and that $F(x)=(m x+b) f(x)$, where $m$ and $b$ are constants. Express $F^{\prime \prime \prime}(x)$ in terms of x and derivatives of f.

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In this exercise, we are tasked to find $F'''(x)$ given that

$F(x)=(mx+b)f(x),$

where:

$m$ and $b$ are constants,

$f(x)$ has derivatives of all order at $x$.

What differentiation rules should we use?

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