4.5.6a I Need Help With This Problem What Is The Common Denominator. 5/6s+2/9=7/12 & For This One To 3/4 = 5/6a+2/9?

I need help with this problem what is the common denominator. 5/6s+2/9=7/12 & for this one to 3/4 = 5/6a+2/9? - 4.5.6a

The common denominator for both is 36