UPSKILL MATH PLUS

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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.]