Question

100-[36+6×9-(a÷3+15)]÷3=77 va rog putin ajutor

Answer 1

100-[36+6×9-(a:3+15)] : 3=77
[36+54 - ( a :3 +15)] :3 = 100 - 77
[36+54 - ( a :3 +15)] :3 = 23 
36+54- ( a :3 +15) = 23 x 3 
90 - ( a : 3 +15) = 69
a : 3 + 15 = 90 - 69
a : 3 + 15 = 21 
a : 3 = 21 - 15 
a : 3 = 6 
a = 6 x 3 
a = 18