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Suppose the function f(x)-f(2x) has the ...

Suppose the function `f(x)-f(2x)` has the derivative 5 at `x=1` and derivative 7 at `x=2`. The derivative of the function `f(x)-f(4x)` at x=1 has the value equal to
(a) 19 (b) 9 (c) 17 (d) 14

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