Complete and balance the following equations:

$($a$)NaHC{O}_3($s$)$Delta

$($b$)CaC{O}_3(s)$Delta

$($c$)$ CaO $($s$)+H_{2}O($l$)$

$($d$)N{H}_3(g)+H_{2}O$

Can i get a detailee explanation of how to balance equations please