5 и 6 выражение пожалуйста

5)6/5(5/6k + 2/5n)-9/5(5/9k-3/10n)
3/5(2(5/6k+2/5n)-3(5/9k-3/10n))
3/5(5/3k+4/5n-323/90n)=3/5(5/3x+4/5n-23/30n)
3/5(5/3x+n/30)
3/51/30(50x+n)=1/51/10(50x+n)
1/50(50x+n)
6)(1/6a+6,5)-(2 7/9a+ 3 1/3)
(1/6a+13/2)-(25/9a+10/3)
(1/6(a+39)-5/9(5a+6)
1/18(3(a+39)-10(5a+6))
1/18(3a+117-50a-60)
1/18(-47a+57)