Question

8/12 + (4/81 + 7/9) = (8/21 + 4/81) + 7/9 ....LHS = RHS verify

Answer 1

2/3+((4+63)/81)=43/100+7/9
2/3+67/81=1.20
(54+67)/81=1.20
121/81=1.20
1.4~1.2
approx

Answer 2

Sorry I can't help you