In your question, it's not only have left recursion but also have loop...
in loop cases first you have break the loop, for that change any one variable of them then another variable doesn't lead to loop
1) change A
A-> Sca/Ada/b
S->Sc/Ad
it looping again and again...... therefore don't change A
2) Change S
S->Sc/Sad/bd
A-> Sa/b
it's does not looping but have left recursion.... now eliminate the left recursion..
E-> Eα1/ Eα2/.../Eαn/β1/β2/.../βm
is changed as
E -> β1E'/β2E'/.../βmE'
E' -> α1E'/ α2E'/.../αnE' / ∈
According to the formula...
S -> bdS'
S' -> cS' / adS' / ∈
A-> Sa/b