✔ 最佳答案
Questions like this worry me in that the asker may mean :-
(i) (2r - 6) / 5 = - 2
OR
(ii) 2r - (6/5) = - 2
Just in case, will do both:-
(i)
2r - 6 = - 10
2r = - 4
r = - 2
(ii)
2r - (6/5) = - 2
2r = -10/5 + 6/5
2r = - 4/5
r = - 2/5
I would be interested to know what you did mean !