234+[(88:4+a)-78:6]×23=809 va rogg​

Răspuns :

234 + [(88:4 + a) - 78:6] · 23 = 809

[(88:4 + a) - 78:6] · 23 = 809 - 234

[(88:4 + a) - 78:6] · 23 = 575

[(88:4 + a) - 78:6] = 575 : 23

(22 + a) - 13 = 25

22 + a = 25 + 13

a = 38 - 22 = 16