k(x)=f(x+4)

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Solution for k(x)=f(x+4) equation: 


Simplifying
k(x) = f(x + 4)

Multiply k * x
kx = f(x + 4)

Reorder the terms:
kx = f(4 + x)
kx = (4 * f + x * f)
kx = (4f + fx)

Solving
kx = 4f + fx

Solving for variable 'k'.

Move all terms containing k to the left, all other terms to the right.

Divide each side by 'x'.
k = 4fx-1 + f

Simplifying
k = 4fx-1 + f

Reorder the terms:
k = f + 4fx-1

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