Question

(7×9-a×5)-9:3=20 cat este a

Answer 1

(7 * 9 - a * 5) - 9 : 3 = 20
(63 - 5a) - 3 = 20
63 - 5a = 20 + 3
- 5a = - 63 + 23
- 5a = - 40
a = 40 : 5
a = 8

Answer 2

(9x7-ax5)-9:3=20
(9x7-ax5)-3=20
             9x7-ax5=20+3
                         =23
-5a=23-63
-5a=-40
a=8