Find the value of 'k' — task. Mathematics State Board, Class 10.

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If

$f(x) = 5x - 4$ ,

$g(x) = 4x + k$ and

$f \circ g = g \circ f$ , then find the value of

$k$ .

Answer:

The value of

$k$ is .

[Note: Enter the answer rounded to the nearest integer.]

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