Suppose the function \( f(x)-f(2 x) \) has the derivative 5 at \( x=1 \) and derivative 7 at \( ...
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Suppose the function \( f(x)-f(2 x) \) has the derivative 5 at \( x=1 \) and derivative 7 at \( x=2 \). The derivative of the function \( f(x)-f(4 x) \) at \( x=1 \) has the value equal to
(A) 19
(B) 9
(C) 17
(D) 14
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