9 140 - Х ) * 3 + 55 = 172

Question

9 140 - Х ) * 3 + 55 = 172

Answer 1

  (9140-х)*3=172-55
    (9140-х)*3=117
   9140-х=117/3
   9140-х=39
     х=9140-39
     х=9101