Question

{13+[25×4-(3×11+3×22)]×m}÷2=13?

Answer 1

{13+[25*4+(3*11+3*22)]*m}:2=13
[13+(100-99)*m]:2=13
(13+1*m):2=13
13m:2=13
13m=13*2
13m=26
m=26/2
m=13