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Relevant equations: F = qV x B (magnetic force)

I know you should probably use cross products for this problem, but I'm unsure of how to use that method in the context of this problem. They're talking about zero net force, so first I tried to find the magnetic force using F = qV x B and got 2673 x + 2187 y. I'm guessing the electric force should cancel this out. I'm stuck on how to proceed from here, and I don't think I even started the problem correctly. Any help would be greatly appreciated!