Can a man treat his wives fairly?

Yes, it is possible.

4:3

Marry of the women, who seem good to you, two or three or four; and if ye fear that ye cannot do justice (to so many) then one (only) or (the captives) that your right hands possess.

No, you will not be able to do so.

4:129

Ye will not be able to deal equally between (your) wives, however much ye wish (to do so).

If you're afraid you won't do them justice then marry only one wife, however you won't be able to achieve equilibrium no matter how much you try.

That's what it's saying, they only compliment each other. Instead of contradicting. (Bowofhak)

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