Question

MgSO4(aq) + 2 NH4OH(aq) → Mg(OH)2(s) + (NH4)2SO4(aq)

Answer 1

It's not clear what did you mean with this equation. But I guess you need the balanced net ionic equation, as I've seen that problem before. So here it is: $Mg^{2+} +2OH -\ \textgreater \ Mg(OH)_{2}$