Question

[(a x 4 - 8) : 4+38 ] : 3 = 17

Answer 1

[(a x 4 - 8) : 4+38 ] : 3 = 17
[(a x 4 - 8) : 4+38 ]  = 17·3 (=51)
(a x 4 - 8) : 4 = 51 - 38 (=13)
(a x 4 - 8)  = 13·4 (=52)
 a×4 = 52+8 (=60)
 a = 60 : 4 (= 15)
       a = 15 .