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Why is F = ma equals to F =mg?

Also what is F = Fa - Ff? It came from this question.

The question is

c) If the box moves at a constant speed of 2m/s-1 when a 50N force is applied, what is the frictional force? (Box is 10kg)

Answer: Constant speed => a = 0

F = ma = 0

F = Fa - Ff (what's this suppose to mean?)

Ff = Fa = 50N

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# F = ma also equals to F = mg? F = Fa - Ff?

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